Looking for new fast game.

Hello, I'm looking for a new game. Currently I play adventure quest 3d and bullet force, but while excellent, both require at least 10min of time and a little attention. So, I'd like to try something new for that times when I'm waiting for the bus or in line and don't really know how much time I got and can't really pay much attention. I was thinking about maybe some rts? One of these build your kingdom stuff. Can you recommend any decent one and also fairly new? Possibly by some stable company. Would prefer to avoid things that got 10 sequels every month or half dead zombies. Thank you really much!