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