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Re:OnLive comes to Ouya, Controller Makes Full Frontal Debut by rsynnott on Friday July 27, 2012 @12:19PM (#4302116)
http://developer.apple.com/library/ios/#featuredarticles/Ext...

See also Core Bluetooth (though that's somewhat different, being for Bluetooth 4LE devices).

Re:OnLive comes to Ouya, Controller Makes Full Frontal Debut by needle0 on Friday July 27, 2012 @01:43PM (#4302586)
http://developer.apple.com/library/ios/qa/qa1657/_index.html

According to this page the external accessory framework can only be used if the accessory developer is participating in the MFi program. I couldn't find any "Made for iPad" logos on OnLive's page.