Super Smash Bros. will not feature cross-platform play, director of Sora Ltd. Masahiro Sakurai tells Joystiq. Since each version of the game has completely different stages, cross-platform play wouldn't work, he told us through an interpreter. Each version will interact with one another, however, as announced back in 2011. Specifically, players will be able to take characters they've customized and transfer them to the Wii U version.
He wouldn't elaborate on exactly what those customizations are, saying only that they won't be costumes and they won't be something that players have to unlock through repetitive tasks. Different costumes, he said, would take away from what makes each character unique. He also wanted to avoid boring, repetitive tasks, while Sora works to produce a "stress free, easy connectivity" between the two versions.
When asked if the level editor would return, Sakurai gave us a "no comment."