Here are the patch notes for the various minor updates. v2.6.1 was only live on beta - v2.6.2 was released a couple of days ago, and v2.6.3 is a small hotfix patch on top of that.

v2.6.1
Fixed a rare bug where an obelisk would generate an obelus ON TOP of the buried treasure
Scrying achievement text now reads "Find an obelisk treasure with no clues apart from the first obelisk"
Fixed a bug that might cause a boat or a resource to be generated on top of a coastline even when there was an empty tile available
Rearranged credits so all of them are visible
Added some new community credits and updated publishing credits
Credits are now larger and better spaced
Removed debug feature that made artifacts draw lines to other artifacts of the same set when holding backspace
Fixed a crash related to defeating hostile pirates
Fixed a crash that would occur when entering a battle while being tabbed out of the game
Fixed a bug that would make units flee more rarely unless you held your cursor above the HUD at the top of the screen
Fixed the placement of tooltips that just move a bit above the top of the screen to not be cut off at the top
Fixed a bug making the "Skilltrees: Off" advanced map setting a bit more random than intended
Fixed a typo that made Fus Sofu and Kop Laka not start with the right spell (Summon Seastar)
Fixed various issues with custom modded units using sprites larger than 24x24
Added some code to make sure that hero units that respawn after death have the correct color and angle
Fixed several issues with random events not occuring correctly during battle, which would, for instance, make all AOE projectiles land in the same spot, or make boats suddenly move strangely during naval combat
Fixed the behaviour of swimming units with ranged attacks. Units can no longer use ranged attacks while swimming
Swimming units now spend less time under water before jumping back up onto the ship
Slightly increased width of Town UI window
Made sure the Summoning Circle will not create units that should not be created by random effects
Increased the size of Wyvern
Reworked Reviving Legend achievement to now require 5 artifacts of a single set
Fixed the Ancient Power achievement to now correctly trigger at 3 artifacts of a single set
Fixed a rare situation where checking for abilities in custom scripting would lead to a crash
Fixed unitskins breaking across mods in case canvas extension is used by a single mod
Fixed a rare bug with backwards compatibility for corrupted saves, which would make the game crash whenever the player pressed the Load button
Made sure that Hostile Pirates would generate unique heroes and armies instead of rerolling the same results again and again
You may now place Rogue towns using the tilemap editor
You may now place settlements using the tilemap editor
Improved the display of what towns are available in the tilemap editor
Using mods will now always export unit group .pngs, even if not using unit group mods (since unit mods might also go into unit groups on their own)
Fixed an issue that made neutral unit mods not correctly add to the right unitgroup when using Rogue Realms
Faction mods now correctly add Hero Class lore to their classes
Fixed rare issues where a hero would get the wrong entourage units when having a specialty unit that had no unit groups - now Puk Aro, for instance, will no longer gain Great Hydra as entourage units
Made sure that faction heroes will use faction units for entourage units if their specialty unit did not belong to any unit group
Amtio now represents the Carrion unit group, and Fromage now represents the Pond unit group
Fixed an issue that would sometimes delete artifacts in the hero's inventory
Fixed a bug with Tailtoads fighting against Fireflies that could make the game hang forever
Fixed Tailtoads' death animation
Fixed a bug causing corpses to not reach the final frame of their animation when playing at 2x battle speed
Fixed a bug causing spell casts to sometimes fail when holding your mouse above a unit while selecting the spell from your spellbook and also your resolution was low
Improved the casting of Firegating and Firetrapping
Fixed a typo that prevented the flying unit air drop and teleswapping unit abilities from working
Fixed a bug related to achievement unlocking that would slow down large maps tremendously in the late-game
Fixed a bug related to flying units getting stuck on the top, bottom or right edge of combat during naval battles
Fixed living units' aura colour being coloured the wrong colour
Fixed units occassionally moving strangely during naval combat
Fixed unit corpses not moving along with their boats
Fixed swimming units occassionally moving at supersonic speeds
Increased the size of the naval combat battlefield and reduced the distance between the boats at the start of battle
Fixed a bug that made the right-side units during naval combat not be placed correctly at the start of battle
Losing skill points in Tactics, Mastery, Bodyguards and Oligarchy now correctly changes command, proficiency and entourage
Fixed a bug that made Entourage and Proficiency gain from Mastery and Bodyguards doubled
Reduced the frequency of Snowbeard and Tailtoad projectiles will freeze the enemy unit
Midas Touch now applies via Snowbeard and Tailtoad projectiles, as they should
Fixed a rare bug which could crash the game when playing on very large battlefields without any enemies left and using units with infinite range
Fixed the following spells which could make immobile units move: Swift Retreat, Army of Giants, Gigantism
Fixed the following effects which could make immobile units move: Echoes artifact set bonus, Chemun tea, Swiftness skill, Rallying, Combat skill (only relevant for modding)
Made the following unit effects no longer make immobile units move: Fast, Light, Flimsy, Flying, Mutation
Switched position of Dragonking and Blight Ritual for RR Puk Aro skilltree
Magmoles are now significantly stronger
Mirrored game files for units now accurately depict the units' stats
Fixed names for some rogue dwellings being switched
Fixed priority of modded heroes spec units when two units have the same name
Updated art for the Arachnian as well as most of the new Ants introduced in v2.6.0

v2.6.2
Fixed a rare bug that could cause a crash when playing as Tide, not having any pearls, and using the Classic town screen
Fixed a crash related to the updated Teleswap ability scripting
Fixed an issue with faction mods that would occassionally make hero portraits for the 5th and later added faction have wrong portraits used
Fixed an infinite stall bug caused by Snowbeards fighting against low-tier enemies
Reduced the frequency of Snowbeard and Tailtoad projectiles will freeze the enemy unit EVEN MORE
Fixed a bug that would occassionally crash the game when a hunted hidden beast was about to respawn
Fixed Reveal full map not working correctly for hotseat

v2.6.3
Fixed a crash that led to faction mods being unplayable for non-English language games
If mods crash the game before reaching the main menu, they now get automatically turned off next time you open the game
Changed unit edit mods to now be able to just edit a few attributes without causing a crash
Patience achievement now just requires winning on the Patience map - the time limit is removed because it led to a lot of issues