Per Microsoft's Major Nelson (linked above): Xbox.com and the Xbox forums will be offline for maintenance on Tuesday, November 18th from 12:01am PT until 4:00am PT to prepare for the New Xbox Experience launch on Wednesday the 19th.
This does NOT affect Xbox LIVE, which will remain available during this time.
Additionally, similar as was done for the PlayStation 3 recently, Microsoft will give Capcom its own "branded destination experience" tomorrow, to coincide with the launch of New Xbox Experience.
The hub will serve as a sort of one-stop shop for all things Street Fighter. Related add-ons and content, as well information on upcoming releases, will be accessible from one single destination.
Press Release: CAPCOM® PARTNERS WITH MICROSOFT® TO PROVIDE A BRANDED EXPERIENCE WITH SUPER STREET FIGHTER® II TURBO HD REMIX
Street Fighter® Branded Destination Experience to be featured in the New Xbox Experience!
SAN MATEO, CA - November 18, 2008 - Capcom®, a leading worldwide developer and publisher of video games, is proud to announce that the much anticipated Super Street Fighter® II Turbo HD Remix for Xbox LIVE® Arcade will be one of the first games to be featured in the New Xbox® Experience with a Branded Destination Experience.
Launching tomorrow, the Super Street Fighter II Turbo HD Remix destination experience will provide a central place for Xbox LIVE Arcade gamers to learn about new content, view the latest trailers, and access downloadable content, including picture packs, and both Basic and Premium Themes.
The new Street Fighter® Premium Theme features extensive high-definition graphical layers that take over your Dashboard, presenting a fully dynamic and encompassing package for the ultimate social entertainment experience on Xbox LIVE.
"With 1080p high-definition art and graphics, and the ultimate user feature set, Super Street Fighter II Turbo HD Remix is the perfect game to compliment the New Xbox Experience," said Christian Svensson, VP of Strategic Planning and Business Development at Capcom Entertainment Inc.
"Capcom is dedicated to providing captivating content to the digital space and we're proud to participate in this new era of Xbox LIVE." More PlayStation 3 News...