Its more likely to do with A:CM cause Creative Assembly's game has had like a month of development, the DS game simply is NOT big enough to do something like this for and it just makes sense.
I thought Creative Assembly has been working on their side scroller for some time. If it's the same game that was showcased in the footage that was leaked onto Youtube then it is actually quite old.
I'm not quite sure how to measure the scope of a stunt that simply mails a few doll heads to a few addresses in the United States...but I don't think I'd describe it as "big." Like I alluded to before, the only thing worth paying attention to at this point is the delivery of real, actual news about A:CM. Every other stunt, gimmick, and promise is pointless to me. I've simply waited too long and my patience is too worn to get excited about a doll's head.