Just registered to ask for a Linux port as well. My brother and I have been working through the first one all via Linux, and it's fantastic! Looking forward to the second one being available for it as well.
Well, if you don't want to wait an interminable period, or forever, as the case may be, simply boot Windows alongside Linux, and away you go. If and when it may arrive in a Linux port, btw, it won't look, play, or feel any better at all running under Linux, guaranteed. Just a suggestion--if you are running an x86 box you don't have to wait at all. (It's running great under Win10x64, latest Insider Preview, if you're interested.) I write this because I know how difficult it was for me to wait for this game, as is--can't imagine waiting for another six months just to find out if a version will be released for a Linux distro, and then maybe a year or more past that to get it...ugh! No Thankee...;) Most commonly, the Linux ports are farmed out to people other than the game's original developers--so, it just seems silly to deprive yourself in that way.
I'm having a blast with it at the moment! Good luck...;)