At 1 p.m. PST on Monday, Maxis will be rolling out the first major SimCity patch. SimCity Update 2.0 doesn't make any especially notable additions—mayors will now drive fancy cars or travel by helicopter if available, for instance—but it does implement a long list of bug fixes and improvements.
The biggest change prevents the infamous residential-only cities from surviving:
Residential Tuning: Residential-only cities have failure state.
Other fixes involve the accuracy of population counting and unexplained fluctuations, fixing issues with students and tourists. The tourism and casino specializations should especially benefit:
Tourism: Fixes for unexplained fluctuation of tourists. Tourists more smartly counted on transit.
Casinos: Casinos tuned so that Gambling will be a more profitable specialty. Players can bulldoze and replace existing casinos to see effects of tuning.
The full patch notes are available on the official SimCity blog. The servers will be taken down for "a few hours" while the patch is issued.