Microsoft made available for download on June 21 the software development kit (SDK) for its recently announced SmartGlass Xbox companion application.
SmartGlass, an application Microsoft unveiled at the E3 conference in early June, is an application for Windows 8, Windows Phone, and other portable devices that will connect phones, PCs and tablets with your Xbox 360 console by displaying supplemental content on those devices. The app will work with iPads, iPhones and Android devices, not just Windows 8 and Windows Phone. SmartGlass is a souped-up version of Microsoft's current Xbox Companion app.
The SmartGlass SDK is available to "partners that have agreements to develop Xbox games or entertainment applications for the Xbox 360 console," a Microsoft spokesperson said. It also appears to be available to Microsoft employees.The SDK is downloadable here.
Microsoft's press release on SmartGlass noted that it will be available "with select games and Xbox Live content and requires Internet connectivity and compatible devices." Xbox Live Gold membership will be required for some Xbox SmartGlass-enabled content and features.
SmartGlass is not available now; Microsoft officials are saying "later this year," which seems to imply there may be an Xbox Live Dashboard update required to make this work.