Due to the server issues this week the DBP has been extended till 11:59:59 CST on Sept 25th. Heck thats enough time to write an entire game!
The contest website experienced a technical difficulty that prevented successful game uploads. In the interest of fairness we have extended the entry deadline for all contestants to September 25th, 2008 at 11:59 PM Central time (CT)
There's also an interesting addition to the rules appeared:
Xbox LIVE Community Games will be launching holiday 2008. To help celebrate the launch, we are extending a special opportunity to Dream Build Play entrants. Although Xbox LIVE Community Games will only be available to developers in specific regions, if you submit a compelling entry, the Xbox LIVE Community Game Team may extend a special invitation to any Dream Build Play entrant to submit a Dream Build Play entry for inclusion on the Xbox LIVE Community Games service. If you receive an invitation, you could be one of the first to sell your game on Xbox LIVE Community Games.
There is some speculation in the forums as to what this actually means... see the discussion
