You can't request this AT ALL. You have NEVER declared a license for the artwork that is publicly available. As it states on the Creative Commons website, copyright by default is to give everyone ALL RIGHTS. The only one who can change that is the creator of the artwork himself.
Oh, and it's great to see an update. Everything's looking spectacular, and I can't wait to see more. I'll have to say, though, I would prefer the idea of "real" updates (more informative, less TUNE-IN-NEXT-TIME) rather than this marketing-esque thing you have going on. But, beggars can't be choosers; you're all developing this game for free, after all, I can't really complain. =P
I gotta ask, who's creating these lovely "presentation graphics" (for lack of a better term)? Like that S2HD logo graphic in the beginning of Vincent's post, that looks really nice.