Windows Phone 7 Series News

Based on Windows CE 6 kernel
Completely new interface for finger-based touchscreen input
Complete social networking intergration.
Zune and Xbox components
Outlook + Office support

Strict hardware requirements
Large WVGA screen with a single aspect ratio (which means BlackBerry-style devices won’t be readily available to begin with)
Five specific hardware buttons required: Start, back, search (a dedicated Bing button), camera button, and [...]

No, there won’t be 5 different little versions you have to choose from. Microsoft’s Rena Lunak said that “Series” simply means that the phone will be continuously updated just like iPhones and Androids.

Announced February 15, 2010.
Built from scratch
New UI (“Metro”)
Xbox Live and Zune integration complete with avatars and profiles
Social Networking built in
4 point multi-touch support
Single phone identity (no customized skinning)
Carrier partnerships are far and wide, including AT&T, Deutsche Telekom AG, Orange, SFR, Sprint, Telecom Italia, Telefónica, Telstra, T-Mobile USA, Verizon Wireless and Vodafone, while hardware partners include [...]

Here it is! The first screenshot of the new windows phone 7 os!