Lack of RE6 on Wii U would just puzzle me more than anything. Developing two RE titles for the 3DS in its first year but not giving the Wii U a cheap port of RE6 strikes me as an odd set of business decisions.
If RE6 isn't on Wii U by end of Q1 2013, I would be shocked. I don't think Capcom will pass on the opportunity to double dip on Nintendo owners by just releasing the Gold version next fall.
It wouldn't shock me if Mercs was there in some form, either.