User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-76.69.5.128-20111117090934

Judging from the official site, Kayamba and Chacha can combine their dances somehow to power-up the effects (might just be that effects stack). There seems to be new dance affects, there's one that mentions items. Kayamba's wearing the new helmets, so if Chacha was wearing that whetstone mask in the first trailer than it looks like they share masks.

Green Plesioth is available offline, since the player fights with both Chacha and Kayamba.

With the touchscreen, you can save three customized panel sets.

Arena gives arena coins. I think Portable 3rd had something different but I haven't played it.