I'll just copy and paste the YouTube comment I made just now, since I already wrote down all of my thoughts there.

It doesn't look as bad as I thought it would be when I saw the trailer at first. The painting system in the battle is like FP in the older games (but here it's used for every attack), plus it can be used outside of battle, and unlike FP it's extremely likely that you can collect more paint for every enemy that you defeat. And there could be a new layer of depth if there really is a system with decks of cards, especially if you don't get rid of the cards after using them (but that would really depend on if the battles/enemies are designed well enough). And since you can collect cards by filling in paint in areas, it's a good way to reward exploration (Which is a thing that Sticker Star had going for it too, so this also needs to be implemented well)

And it's likely that the world map could be the same as how you travel in Paper Mario 64, just a lot quicker since it's translated into a world map. And there could also be a collectathon aspect to the game if there are red stars to collect for every level/area. The only drawback that I see is that it doesn't look like there will be partners in the game (There is a bucket character, but you don't see them follow Mario around, or fighting in battles), and we don't know if the story will be as good as the first 3 Paper Mario games.

So I think the game has a lot of potential, but you can't really know with Nintendo if they're gonna screw things up or not.

Im actually looking forward to this game, strangely I'm getting nostalgia from Thousand year door after re-watching the footage. I think Colour Splash is going to be decent.

Wow... it actually looks really interesting! It looks better than tearaway.

I might actually buy my first PM game.

Eh, meh.

Heh, good one! We should be thankful if Bowser actually says a god damn thing in this game.

This analysis actually makes the game look a bit more interesting. I actually like trading card games so if we have an option to customize our deck or hand based on the cards we get, this could be an interesting take on Paper Mario's battle system. Going to miss badges and flower powers a lot though.

However, I'm still worried about the writing for the games' characters and your partners. That is if you get any other than that magic paint bucket.

Seems like some of my bigger complaints about Sticker Star were addressed. I actually liked the idea of having tons of different attacks, but it was implemented in an awful way. Still not completely sold.

Actually, if the possibility of making a customized deck of cards is there, with the inclusion of that "paint" management, and if now there's a point to battle, which is pretty much solving some of the SS issues, it could be at least a fun game. Though I'd like them to make a strong plot, with charming partners an all of that. But I really don't think this is the case...

It looks like it's going to feel like Paper Mario 64 which imo, is a good thing. I liked that Paper Mario more than the others.