After being announced in the early hours of Wednesday, Nintendo has revealed to Joystiq
that their upcoming Wii U and 3DS Super Smash Bros. will not be featuring cross-play support, instead offering individual battles between the two platforms.
According to the interview, director of Sora Ltd. Masahiro Sakurai told Joystiq that due to "each version of the game has completely different stages, cross-platform play wouldn't work." This however doesn't rule out interaction between the two platforms, with Sakurai pointing out that players will be able to customise their characters and transfer them between 3DS and Wii U similar to the system in place for Capcom's Monster Hunter 3 Ultimate.
Sakurai didn't reveal what exactly these customisations would be, but what he did rule out was that they wouldn't be "costumes and they won't be something that players have to unlock through repetitive tasks." Sadly no further comment was given when asked whether the level editor would be making a return but hopefully we will hear more before the expected release in 2014.
Super Smash Bros. will be coming to both 3DS and Wii U.