FINALLY, EA/Maxis stopped screwing around with all the side games and has pushed on the main series! It is supposed to be released in February, 2013. It is going to have MUCH more stuff then Simcity 4, such as City specialization and multilayer. More at http://www.simcity.com/en_US/game/overview
EA revealed/leaked pretty much everything before E3. Mostly because they know they'd have a lot less viewers otherwise.