While we already know that Life is Strange is coming to Linux from Feral, we don't know when, but we do now know that Life is Strange episode 1 will be free from tomorrow.
We should see this coming by now. The Cossacks 3 release date has been announced and I have it confirmed personally that the Linux release is now delayed.
Thanks to the masses of people for letting me know. Undertale, the 2D RPG where you don't have to destroy anyone is now available for SteamOS and Linux.