Luigi's Mansion: Dark Moon and Pokémon Mystery Dungeon: Gates to Infinity - all arriving on March 24. If you're picking up Gates to Infinity, make sure you also grab the free 'Poké Forest' DLC, which only stays free until May 1. After that it'll cost $2.
The other big release of the week is Zen Pinball 2. The Wii U download is free, and lets you have a trial run with all of the game's available tables. After that, it's gonna cost ya.
As ever, the full list of this week's releases is after the break.