Mega Man & Bass, known as Rockman & Forte in Japan, is my favorite Mega Man game. It originally debuted on the SNES, but was later converted to the Game Boy Advance — it’s the latter version that will be coming to the Wii U.
The GBA version is slightly worse as it has more muted colors and worse sound effects, but it still works just fine. Expect it on the Japanese eShop on February 18, and hopefully internationally sometime in 2015.
Rockman & Forte [Nintendo]