Since I didn’t find a search function, but I thought I’d ask.
I have a few friends that would be interested in playing Dirty Bomb, but use Linux, and considering DB is using UT engine, Linux support should not be hard to do.
It would certainly bring more people to the game.
I guess this is not main priority since it might be not as easy to do as u think it will be. But I’m pretty sure if it’s not such a big deal they will do it later on! 
According to wikipedia, it supposedly has support for it http://en.wikipedia.org/wiki/Unreal_Engine#Unreal_Engine_3
So hopefully it will be.
there’s only a handfull of games ported atm
here’s a quote from Ryan Gordon
"The final problem is there’s no easy way to bring the latest Unreal Engine games over to Linux. This is a significant blow considering a good portion of everything you played this generation was probably built on Unreal. Mass Effect, Gears of War, Bioshock, Dishonored, XCOM, Borderlands – all fine products which won’t run on the current version of Linux.
The one good example of an Unreal Engine 3 Linux Port is Dungeon Defenders, which took an enormous amount of work and the personal expertise of Ryan Gordon (basically the god of Linux ports) to accomplish. Even then the performance was markedly poorer than on Windows.
Gordon explained to GamingOnLinux that it took a combination of Mac, Android and iOS ports of UE3, a smattering of previous work from an Unreal Tournament 3 port and a healthy dollop of new code.
Will the Unreal engine ever make it to Linux?
Will the Unreal engine ever make it to Linux?
“I think such a strange brew could be applied to other games, but all will need a lot of custom scrutiny and merging, depending on what codedrop they started with,” Gordon said.
“So, technically, this isn’t the worst problem to have, but no existing UE3 title will be as straightforward to port as UE2 titles were. I suspect we’ll see a few come to Linux, but I don’t have anything in the pipeline at the moment in any case.”
While it’s possible, when Linux has such a low market share larger studios just don’t have the incentive to invest their time porting games across. No UE3 doesn’t mean no AAA Linux games but it takes a huge portion of them out of the equation considering it’s the most popular engine for big studios floating around at the moment."