I really wonder what is going on with EPD7. We know they have Famicom Detective Club, but that's being developed externally. Their other rumored game is a 2D Metroid which is assumed to be with MercurySteam again.
I wonder if they've just become an external group like EPD 6? Been a long time since we saw a game internally from them.
If we assume that Takehiko Hosokawa is working on another 2D Metroid, that only leaves Rhythm Heaven and Tomodachi as EPD 7's tentpole franchises. WarioWare was moved over to EPD 6 and Intelligent Systems.
Two of Tomodachi Life's directors worked on Miitomo and aren't known to have been on anything else since. The third one was a planner on Ring Fit Adventure. I expect the series to return at some point since Life did really well.
Rhythm Heaven is the one I'm less sure of. We know that the series producer had cancer, which might be why Megamix was an expanded compilation. He's publicly said that he'd like to work on another game on more than one occasion, so I wonder if that means there's nothing happening. Masami Yone, the series sound director and who also directed Megamix, has only been credited in Brain Training Switch since.
There was also the time that Katsuya Yamano randomly popped up in the Special Thanks section for the Switch port of Tropical Freeze, despite never being involved with Retro or DK beforehand, so I wonder if EPD 7 and Retro were working together at some point.