Though there's no official announcement yet, the rumors are starting to solidify with a name, Taiko no Tatsujin Tokumori (meaning 'super special') which sounds similar to the names given to the later Taiko games on Wii. It apparently has 100 songs in it by default and will launch in Japan on November 20th, 2014.
Stay tuned for more info as we confirm the rumors!
Source: nintendoeverything.com