Well, Namco Bandai is teasing something for Taiko: Drum Master for sure. Wada-don is featured on a countdown site with a timer set to 12 days (or 13 depending on your time zone).
The Wii got a new Taiko: Drum Master game last November with the subtitle "Definitive Edition." Perhaps, they’re going to bring the tapping series to another platform? Or maybe this is for a new arcade game. I think Taiko no Tatsujin 14 is almost two years old now.