Sorry, if already posted, a forum search didn't show anything.
There is a rumour, that MH4U might come to the WiiU. This article is in german: http://wiiunews.at/wii-u-spiele/19139-geruecht-kommt-monster-hunter-4-ultimate-fuer-die-wii-u/
But the most important info are the images anyways, this seems to be from TGS: