To my knowledge there has been no change in noseart upload procedure. They do have to be approved by HTC and they might bigger fish to fry right now with AH2 coming out. It might take some time for new art to be approved.
I would think, and this is a real guess, with the carryover of points and squads; AH1 noseart would have come over as well.
Again, these are just my thoughts and usually when I think..... trouble follows.