Coming from a GamingBolt interview with Ubisoft's Maxime Beland...

“Splinter Cell Blacklist as a game is a great fit for the Wii U. What’s fun and interesting is that Sam Fisher has an OPSAT in the game that he uses in the same way players can use the Wii U gamepad when playing Splinter Cell Blacklist. Sam uses his OPSAT to control gadgets like the triorotor, which the player can also do using the gamepad. I’m proud of the fact that our Wii U implementation makes sense in the Splinter Cell universe, it feels like a really natural platform for Splinter Cell Blacklist,” he said.
He further justifies why Ubisoft are still invested in the Wii U and how they are looking for new technologies to enhance gameplay.

Ubisoft Toronto is looking at new technology and seeing in which ways their features make sense to use for our brands. As I mentioned earlier, using the Wii U gamepad for Splinter Cell Blacklist makes sense. It’s an extension for what Sam does in the game. It’s great feeling when new technology immerses the player into gameplay in a fun and realistic way.”

Link