I posted this same thing in the Steam community thread and figured it should be here too:
Hey all! I am pestering people to let me talk about Linux version news and I haven't gotten the green light to speak publicly about it yet. The moment I am able to I will give you news! It's really frustrating for me, after professing that I would give more frequent updates, that something would come up that would make me unable to talk about it. :( I'll explain once I can finally talk about it.
I wanted to clear up some confusion about the content coming to 2nd Encore. First of all, the eventual Linux version will be identical to the PC version. This means that if we're able to bring the 2nd Encore content from the PS4/Vita versions - i.e. voiced story mode, challenges, etc - to PC as DLC, then that will be an option for the Linux version as well.
I think someone on here asked if they would have to purchase the Linux version separately on here, and the answer is no. If you own the game on Steam already, once the Linux version is released, you will automatically own that version too.