I got Cities 2010, it's pretty great, i like to just lie down roads and make nice screens out of it than actually bother with city building, lol. 2011 is just more optimized with more buildings, and no multiplayer. Don't think it's worth spending another 30 dollars when i already got 2010.
Oh, in related news, Electronic Arts purchased the url "
www.simcity5.com" a few months ago.. Thats all i've heard on that front.