Billed by Microsoft CEO Steve Ballmer as "the next generation of Windows Phones," the Windows Phone 7 operating system will be available on handsets from a variety of vendors, including AT&T, T-Mobile, Verizon Wireless, Samsung and HTC Corp.

Explaind Microsoft of the Windows Phone 7 Games Hub:

Games. This hub delivers the first and only official Xbox LIVE experience on a phone, including Xbox LIVE games, Spotlight feed and the ability to see a gamer's avatar, Achievements and gamer profile. With more than 23 million active members around the world, Xbox LIVE unlocks a world of friends, games and entertainment on Xbox 360, and now also on Windows Phone 7 Series.

A few more details, like turn-based multiplayer games, emerged in a second PR:

• Collect Achievements and build your Gamerscore
• View Xbox LIVE leaderboards
• See your Xbox LIVE Avatar
• Access Spotlight feeds, including the latest tips and tricks, game news, updates and more
• Add Xbox LIVE friends to your friends list while out on the go
• Turn-based (asynchronous) multiplayer gaming

As for an overall breakdown of the new mobile operating system and its offerings:

Designed for Life in Motion

With Windows Phone 7 Series, Microsoft takes a fundamentally different approach to phone software. Smart design begins with a new, holistic design system that informs every aspect of the phone, from its visually appealing layout and motion to its function and hardware integration. On the Start screen, dynamically updated Designed for Life in Motion

With Windows Phone 7 Series, Microsoft takes a fundamentally different approach to phone software. Smart design begins with a new, holistic design system that informs every aspect of the phone, from its visually appealing layout and motion to its function and hardware integration. On the Start screen, dynamically updated "live tiles" show users real-time content directly, breaking the mold of static icons that serve as an intermediate step on the way to an application. Create a tile of a friend, and the user gains a readable, up-to-date view of a friend's latest pictures and posts, just by glancing at Start.

Every Windows Phone 7 Series phone will come with a dedicated hardware button for Bing, providing one-click access to search from anywhere on the phone, while a special implementation of Bing search provides intent-specific results, delivering the most relevant Web or local results, depending on the type of query.

Windows Phone 7 Series creates an unrivaled set of integrated experiences on a phone through Windows Phone hubs. Hubs bring together related content from the Web, applications and services into a single view to simplify common tasks. Windows Phone 7 Series includes six hubs built on specific themes reflecting activities that matter most to people:

• People. This hub delivers an engaging social experience by bringing together relevant content based on the person, including his or her live feeds from social networks and photos. It also provides a central place from which to post updates to Facebook and Windows Live in one step.
• Pictures. This hub makes it easy to share pictures and video to a social network in one step. Windows Phone 7 Series also brings together a user's photos by integrating with the Web and PC, making the phone the ideal place to view a person's entire picture and video collection.
• Games.This hub delivers the first and only official Xbox LIVE experience on a phone, including Xbox LIVE games, Spotlight feed and the ability to see a gamer's avatar, Achievements and gamer profile. With more than 23 million active members around the world, Xbox LIVE unlocks a world of friends, games and entertainment on Xbox 360, and now also on Windows Phone 7 Series.
• Music + Video. This hub creates an incredible media experience that brings the best of Zune, including content from a user's PC, online music services and even a built-in FM radio into one simple place that is all about music and video. Users can turn their media experience into a social one with Zune Social on a PC and share their media recommendations with like-minded music lovers. The playback experience is rich and easy to navigate, and immerses the listener in the content.
• Marketplace. This hub allows the user to easily discover and load the phone with certified applications and games.
• Office. This hub brings the familiar experience of the world's leading productivity software to the Windows Phone. With access to Office, OneNote and SharePoint Workspace all in one place, users can easily read, edit and share documents. With the additional power of Outlook Mobile, users stay productive and up to date while on the go.live tiles" show users real-time content directly, breaking the mold of static icons that serve as an intermediate step on the way to an application. Create a tile of a friend, and the user gains a readable, up-to-date view of a friend's latest pictures and posts, just by glancing at Start.