Anything but Q4 should be ok for them. In light of the recent acquisition I'd guess they really need this one to be financial success in order to get that M$ juice flowing for future projects.
If it supports Linux I will.
A bit off topic, never really understood the adamant stance on Linux that some take... I mean each project, especially Obsidian ones, has limited budget that probably can be spent better on the actual game. Also Unreal leaves some to be desired regarding Linux.
After all PC running multiple OS for different use is not really a big deal, unlike other platforms.