Ok some "weird" thing happened here: just for fun i tried iMessage and... it works! I don't know if it's because I was beta tester a while ago or what... anyway it looks like it's working! Other iCloud features are working also.
I didn't import any setting like suggested in some other post.
In case I'm here to help
Me too, i dont migrate lion account, just setup icloud on first setup assintant, and all works, imessage, facetime, icloud, find my mac....