Could be cool if they got the Critical Role cast involved in this game.

[Rhalius]

Of course Solasta is it's own setting so I don't think we should see Vox Machina, the Mighty Nein or whatever their third adventuring party may be called show up.

But they are a bunch of talented voice actors and playing D&D has pretty much become their main job.
Matt has also dabbled quite a bit with creating D&D content too. Setting, items, sub-classes, new class, etc.

Could be a pretty great collaberation if their voice work can be afforded by the team, but it certainly seems like something that would be great advertisement for both parties involved.

I'd certainly trust them to provide some great player voices if possible since most seem to have a pretty wide range.

Could also be fun if maybe some items from the Critical Role campaigns show up in Solasta. I'd certainly love to see a cursed sword like Craven Edge, maybe a bit weaker since that was used at a higher level but that could be cool.
Daggers that return back to the owner after thrown would be pretty neat too.

And of course it could be pretty awesome if Matt got to design an encounter or dungeon area and voice the NPC in there as well.

[RJM]

They didn't have the money to licence the full official ruleset. If they ever found enough money to start collaborating, I would hope they would use it to buy more of the rules.

Matt & co are wonderfully entertaining, but their style of game is far more about the roleplay and far less about the combat.