I am sooo excited for this. Previews make it sound like they really went all out here, and the success of the first game loosened up a lot of restrictions on what they were and weren't allowed to do, at least with the Rabbids. Apparently the Rabbids talk now, which is weird, but the result looks like a wide variety of wacky NPCs that Mario RPGs tend to lack nowadays. The first game looks tame compared to this one, and the first game was really freaking weird. I will always love that the story was "oh no, our worlds have collided into a twisted hellscape" that ended with them just... not fixing it, because why not keep things this way, it's fun.
The battles also look really cool, and less restrictive. It looks like you can have a party without Mario in it, or a party of all Rabbid characters, or all Mario characters. I'm hoping that's an open option and not just relegated to particular story moments. The first game was carefully balanced around those restrictions but they still felt annoying. I'm guessing the more traditional RPG structure will have some trade-offs, balance-wise, but that just means the first game will still be worth playing, because it will be different from this one.
Also, Rayman DLC! I'm pumped. I hope he gets to interact with Mario and isn't completely siloed off like the DK DLC, though the DK DLC was great. Y'all played the DK DLC, right?