They have stated that, but no evidence of end to end encryption has been found by people reverse engineering FaceTime/iMessage. It appears to use SSL/TLS to and

They have stated that, but no evidence of end to end encryption has been found by people reverse engineering FaceTime/iMessage. It appears to use SSL/TLS to and from Apple's servers, but there's no sign of it being encrypted otherwise. Messages can be sent to all devices of a user, which means if there was end to end encryption the key would have to be distributed across those devices, which would presumably require it residing on Apple's servers at some point, where it could be stored. And people have received other users' iMessages in the past, unencrypted.