Boba actually is a sort of clone of Jango Fett. But he raises him as a son, as he is the ONLY perfect clone of him, and the ONLY one that is not given the acellerated growth stuff... meaning Boba ages at a normal rate, so that Jango can raise him as a son. So he's really an identical clone son.
Weird to have your son be your twin. :b
But I guess we know what Boba Fett looks like now. At long last, its out.