Strange, we already have the demo in UE. And funny, we can't buy CitiesXL from Impulse... Hum, I smell a big conspiracy
Well then by all means get on that demo and tell me about it! 
But ya, from what i've seen the dates they are setting are a bit... odd. The US demo doesn't come out til the 8th, and unlike most games it is released a day after the EU... However, from the impressions i'm getting online, it looks like it could be quite fun. Then again, so did Sim City Societies *is scarred for life.*