The moment finally arrived. At a much anticipated press conference at MWC 2009 in Barcelona, Spain, Microsoft revealed Windows Mobile 6.5, the next version of Windows Mobile software that will power smartphones from many mobile headset manufacturers such as LG and HTC.
Microsoft also announced Windows Marketplace for Mobile, an app store that will provide Windows Mobile apps, and MyPhone, a service to synchronize data on your Windows Mobile phone to the web.
Well, There is some good information here for Mobile 6.5 (Not 7) as mentioned earlier. Would be nice to get more details on the arcitecture differences if any.
http://i.gizmodo.com/5154385/windows-mobile-65-hands-on-the-new-interface-rocks