Nothing noticeable IMO. Bayonetta didn't even reach 1m on 360 and it crawled to 1m on PS3. If this game couldn't sell well on these sytems what makes you think it'll sell well on Wii U?
Just because the first didn't sell a mil on X360 and PS3 barely sold a mil doesn't mean its sequel wont sell well, even if its exclusive to nintendo. Thats ignorant, Alot of people never heard of the game but might now kno and want it, Out of all 2mil user base it had there could be half of them get a wii u (if not already have) and make the purchase and then include newcomers to the series (ninty fans) and now you have a 1.2mil-2mil. An ex of a game increases alot is far cry http://www.vgchartz.com/gamedb/?name=far+cry&publisher=&platform=&genre=&minSales=0&results=200 . its now going on to be by far the best, So why cant Bayonetta 2 be?