the same website that said the wii u is weaker, have a new article about the wii u games will cost double to make because of higher polygon counts and better textures, Wii U's development costs will be higher than Wii titles due to increased resolution, but utilizing the tablet controller will also mean additional time in design.
http://www.gamesindustry.biz/articles/2012-04-03-next-gen-con...