If iTunes switches, then everyone will use it ... They use a different technique than in other lossy codecs (mp3, acc, etc.) without a psychoacoustic model. An

If iTunes switches, then everyone will use it ... They use a different technique than in other lossy codecs (mp3, acc, etc.) without a psychoacoustic model. And the algorithms are actually quite old and not patented anymore (as in aac, mp3) - so in theory it should work ;) However, I think libopus should also compile on the iPhone, so it should be possible to play .opus files on i-devices.