Sam Fisher may have sneaked by on this one.
A Splinter Cell Blacklist display was found in a GameStop, according to a NeoGAF user. The forum user found this display in his local GameStop in Dublin, Ireland.
Even though we've seen no evidence to indicate Blacklist will be coming to the Wii U, this is not the first hint that this game might come to the Wii U. A video from HipHopGamer also noted that Splinter Cell would be receiving a Wii U release.
Until Ubisoft reveals something concrete, this remains merely a rumor.