I'd be utterly amazed if it turns out not to be an official Takara product, given that we've seen a few copies in various stages of development from different leakers. Also no 3P or KO company have come forward to claim ownership either. If it is a hoax then it's a very well coordinated hoax.
I do take your point that even if it's legit it still may not be released, but the recent Superbowl trailer has got me feeling pretty confident.