Just saw this on Gematsu : Namco-Bandai is working on another Taiko Drum Master for the 3DS, coming out on June 26 (75% complete). Title is Taiko Drum Master: Don and Katsu’s Space-Time Great Adventure, and it'll have RPG-like features (probably an adventure mode, like the 1st 3DS game).
Some pics and info from Famitsu :
In this game, Don travels through time to protect History, along with some characters in JRPG-like party. This time, we got explorable 3D environnements. You can also use various items (such as potion), along with costumes which change Don's status and stats. There's also a "battle music system"
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The drumming game supports up to four-player multiplayer, and features an RPG-like “Space-Time Great Adventure Mode”
Famitsu has part of the track list published, which hasn’t fully leaked online, but it reportedly includes a Vocaloid song that has been causing a storm lately.
The game will also come with customizable elements that will affect the overall status of Don-chan.
Some pics and info from Famitsu :
In this game, Don travels through time to protect History, along with some characters in JRPG-like party. This time, we got explorable 3D environnements. You can also use various items (such as potion), along with costumes which change Don's status and stats. There's also a "battle music system"
Source 1 - 2