Yeah I noticed the Takara too, I think you're right, it can't be Hot Toys but it looks identical to the proto's we've seen.
I've edited my post with:
"I believe studiosunny sells the real thing (I've bought already a few things from him) BUT some of the pictures where the tumbler is seen with a takara batman, IS the R/C model....I can see it on the front tires (that thick line in the middle of each tire) see also here:
also the antenna's on the flaps are gold, on the R/C model you do not have antenna's on the flaps."
I have mailed studio sunny, with the question to take some pictures of his hot toys tumbler and to send them to me or to at least post those pictures on his ebay page...