Xenonauts V1.09 was meant to be the final version of Xenonauts, however we have decided to add Steam Workshop support and do one last update to the game to celebrate our successful launch!
The first thing to mention is there's been a very small patch to the current version of the game to fix a bug in the final mission where it was possible to damage the final door so badly it could not open. It is now entirely invulnerable and this can no longer happen.
Onto Xenonauts V1.5 and Steam Workshop support. Both of these are in testing mode at the moment and will hopefully arrive on the main branch in the next month or so - although anyone that wants to test them immediately can also do so!
V1.5 will not include additional content like new levels or new units, but it fixes a number of interface issues and minor issues in the game - basically it just cleans up the gameplay experience and also adds better mod support (the biggest change is an improved line-of-sight system that fixes some of the sight issues in V1.09, but there are plenty of others).
If you want to take part in testing V1.5 or Steam Workshop, please follow the links here:
Xenonauts V1.5: http://www.goldhawkinteractive.com/forums/showthread.php/12291-Xenonauts-V1-5-Experimental-Released%21
Steam Workshop: http://www.goldhawkinteractive.com/forums/showthread.php/12312-Steam-Workshop-Testers-Needed%21
We'll keep everyone updated as both of these things close in on being released on the official Xenonauts default branch!