Major Nelson has posted an entry on his site detailing the new dashboard that is arriving tonight. This new dashboard is set to begin rolling out tonight at 3:01AM Eastern /12:01AM Pacific on November 12.
TL:dr: NXOE starts rolling out after 3:01am ET/ 12:01am PT November 12th. Back Compat titles will be playable or start to appear in your collection (for digital purchases) after 3:01pm /12:01 pm (Noon) PT on Thursday
https://www.youtube.com/watch?v=5AvMMbjjMQ0
