Two updates were recently made to the Search API for software related results. These include noting if an app is Universal and the inclusion of a new value.

The new value added is labeled "features" and will include elements representing specific app features, such as if the app is Game Center enabled or is a Universal app.

Eg.
The query http://itunes.apple.com/lookup?id=284288607 would return - "features":["iosUniversal"], - as it is a Universal app but is not Game Center enabled.

The query http://itunes.apple.com/lookup?id=375295479 would return - "features":["gameCenter", "iosUniversal"], - because it is both a Universal app and is Game Center enabled.

Please note that because apps supporting Game Center are now called out in the new "features" value the isGameCenterEnabled key will be deprecated in a future update. Please move to this new format as soon as possible.