I would like too see support for Linux user's in 1.5 and or 2.0. I know this can not happen in the i.23 ver. thanks to all that are making this a possible.
UE4 supports this and at least so far, it hasn't been a problem so long as you are running a setup that is very similar to a SteamOS box. I keep an image of it up and periodically pull the current build over there to make sure it's still working. Doesn't do so good on my Fedora rig, on the other hand. Haven't spent much time sorting out why as of yet - it's sort of a bonus target platform rather than a priority right now.
I'm inclined to think, however, anyone who's adamant about their main box being Linux will have minimal trouble coping with a dualboot Steam setup so long as they don't have a philsophical opposition to Steam.