A brand new scan from Shonen Jump magazine confirms Naruto Shippuden: Gekitou Ninja Taisen Special to have 41 playable characters and Wi-Fi! Also, Shikamaru and Ino have been confirmed as playable characters. Lastly, the scan shows Susanoo, which implicitly confirms Itachi.
Naruto Shippuden: Gekitou Ninja Taisen Special is slated to release in Japan on December 2, 2010 for the Nintendo Wii. No American release has been announced.