Its back again you can sign up now to get the Facebook and Twitter updates early.

Xbox 360 Dashboard Update... updates: Preview program reopened, Sky TV due Oct. 27

The dates for those who dont get into the preview program

Sky TV 27th October

Facebook and Twitter 17th November

This is probably worth doing as even if you don't get in the first run they tend to roll the update out early for anybody that took the time to register a few days before official release.