Whilst having similar games, the Wii U and 3DS versions of Super Smash Bros. won't feature cross-platform play.
Speaking in an interview with week with Joystiq, series producer Masahiro Sakurai explained that because each version has different stages, cross-platform play simply won't work. So those hoping to perhaps use their 3DS consoles as controllers for the Wii U edition will sadly not be able to.
Cross-platform play isn't a foreign idea either - Capcom successfully integrated both the 3DS and Wii U versions of Monster Hunter 3 Ultimate, adding a new layer of immersion for series fans.
That said, because both versions of Super Smash Bros. are being developed at the same time, there will be the option to take characters developed on the 3DS edition and transfer them onto the Wii U. Sakurai highlighted that these features won't be limited to costumes or repetitive tasks, and feels that different costumes would take away from what makes each custom character unique.
What are your thoughts - would you have wanted cross platform compatibility in the new Super Smash Bros. titles?