The first announcement made in the Super Smash Bros. 3DS/Wii U Nintendo Direct is the release window, or should I say release windows. The 3DS version will be coming out on Summer 2014 while the Wii U version will be premiering in Winter 2014.

Sakurai's reasoning for this is because he needs more time to fine tune the Wii U version. Seeing all the differences between the two versions, I can definitely understand the need for the extra time.