We pleased to confirm that  cocos2d-x for Windows Phone 8 is also now available.

Coco2d-x is one of the most popular and open source 2D game engine worldwide, and used by 570+ game apps crossing iOS/Android/Windows8. A

With cocos2d-x for Windows Phone 8, game developers can quickly develop new game apps, and easily migrate the existing game apps from iOS/Android and Windows 8 to Windows Phone 8. You can download the latest version at here, and please share its broadly to your game partners.

Announcing in Build keynotes: see http://www.buildwindows.com the keynote http://channel9.msdn.com/Events/Build/2012/1-001 includes some lovely demos of the frameworks if your interested in this is 1hour 30 mins in.

Announcing in cocos2d-x community website: http://www.cocos2d-x.org/news/76