We now have scans to confirm all the new Game Music the last 3DS3 Update, thanks to the Japanese Nintendo Tumblr site.
Mechanics-wise, we also see the return of the Gekitotsu note (spam drumrolls more than opponents, the same as Wii2, really) and Taiko Magic (gather gauge then click mark to activate) in static action with screenshots.
And like 3DS2, there are also guest character battle members that you can recruit. The first to reveal are Otomo Airou from Monster Hunter (X) and Reimu Hakurei, Marisa Kirisame and Sakuya Izayoi from the Touhou Project series. The im@s SideM dancers also make a portable expy in DRIVE A LIVE.