This service pack has been anxiously awaited by many people, but:
- Vista support won't be contained in the service pack. For that, we're going to have to wait until Q1 2007. A public beta could be released tomorrow, but don't quote me on that.
- If you are developing against certain consoles using native code and not XNA, you'll have to hold off on installing the service pack until it is supported. (Same goes for previous iterations of said console and SP1 for previous iteration of the compiler...)
When the service pack is ready (supposedly, around 9am Pacific), you'll be able to download it here.
(Update 12/15, 8:55a: Well, it's a couple of hours early, but the service pack is up for download.)