Luigi steals the spotlight today with his New Super Mario Bros. U DLC New Super Luigi U. If you have the original game, you can buy this add-on for $19.99, which comes with a new character and 80+ new levels (or you can wait until July/August for the EU/US respectively, and buy the $29.99 standalone disc). The Wii U is also getting a full download of Game & Wario on June 23rd, along with Mario Bros. (VC) and Wrecking Crew (VC), and Little Inferno is discounted to $4.99 until June 26th.
On the 3DS side, Project X Zone will be hitting both the retail and the downloadable realms on June 25th, along with LEGO Legends of Chima: Laval's Journey. Mario & Sonic at the London 2012 Olympic Games, BUGS vs. TANKS!, Farming Simulator 3D, Defenders of Oasis (VC), Mega Man 6 (VC), Sonic Blast (VC), Tails Adventure (VC), and Rhythm Core Alpha (DSiWare).