From today, Japanese Nintendo 3DS users can try out the new portable Taiko game with the download of a demo version! Here is a gameplay video of all the stuff being featured.
Just like for the first Taiko 3DS game's demo, this one already features one of the full release's many secret songs! Sampling Masters AYA's Lightning Passion will make its return on console games as one of the first boss fight tunes of the game's story mode.
EDIT: Clearer lineout from Nicovideo. Thanks to crystalsuicune for finding it!