guess what! I love Rhythm Heaven! Even though I know a new RH game will fully 100% definitely be announced in the Switch 2 Direct (please), Im still gonna put out my idea for what a new RH game could be.
If we get anything, at the very least it will be a port of Megamix. Of course, a brand new game would be the best case scenario, but that likely wont happen. Im putting my idea right in the middle of those two things: A Megamix port with new content, called Ultra-Mega Megamix.
The new content will be in the form of all the missing games in Megamix, and 5 new Remixes. The "missing games" are the ones that werent originaly in Megamix. The normal games will be split up into different worlds like the Main Story, but instead of having 1 game from every entry like it does in the Main Story, the games will just fit a certain theme. Sequels can be included here too. For example, Circus Land could have Tram and Pauline, Munchy Monk 2, Donk-Donk, and maybe a new Rhythym Game. You get the idea.
Anyway, after we go though all the lands and get through every Rhythm Game that wasn't in Megamix (Sequels don't count as not being in Megamix), you would reach Remix Land. Remix Land contains 5 Remixes. Silver Remix (GBA Remix 6), Gold Remix (DS Remix 10), Fever Remix (Wii Remix 10), Mega Remix (A new medley Remix containing all the new games from Megamix and Ultra-Mega Megamix), and Ultra Remix (A new medley Remix containing every single Rhythym Game. This one's a beefy one.) Ultra Remix is split up into 4 different sections, 1 section for each game in the series. Since this remix is huge, each section has its own Perfect Challenge. However, you can attempt to perfect the whole remix together from the museum. If you do so, you will get a special reward.
Also, if the Switch 2 Mouse thing ends up being true there would be an option to use the mouse to do flick controls like in DS. You would need to hold the other Joy-Con like normal for games that require A,B, and + like Toss Boys.
Anyway yeah thats my idea for a Megamix port with extra content see ya :3