Rumours that Splinter Cell: Blacklist will be making an appearance on Wii U are doing the rounds as French Amazon list it on their site. The page contains no Wii U specific information, so it could be a simple case of an oversight, but retailers have tended to be the first to know about ports in the past so it's certainly not far fetched to think Sam Fisher is heading to Wii U.
The PC, PS3, and Xbox 360 versions are confirmed for release this August.