Last note I got from Mike Ward (Vice-President of Central Florida market) on 17 January 2006 was that the Lakeland/Orlando market would be in operation by late this year. East Central coast to follow.
The best indicator of when MetroPCS is about to start operation is when they post on their www.metropcs.com web site openings for sales associates for the retail stores.
Right now they are posting openings for RF engineers, so the construction of cell sites is still underway. I'd say when they advertise for full-time and part-time retail associates, the launch date is about 1 month away.
On 8 March 2006, www.metropcs.com had 11 openings for their new Dallas area stores, the market launch is scheduled for this week.