Yeah I definitely want to try and support Linux. There's already a Linux build, though it doesn't get a lot of testing -- I've had one playtest with a player running on Linux and he didn't report any issues, but that was a while ago.
Hard to make any guarantees right now in terms of when it'll be available relative to the other versions -- will have to see how much of a time investment it ends up being. It might not cause any headaches at all and it'll be there day one, or we might need to wait on that so it doesn't put too much of a drag on the Windows/Mac development. Won't know until I'm farther along and get more testing on the Linux client.