I'm holding out on the confirmation of the "one-and-done" aspect of battle cards. That's legitimately the only think that will kill the battle system. Adding the depth of color management is a welcome change just because it adds another level of resource management. But the appeal of creating card hands (Mario can be seen looking at his hand in one clip) could tip the scales on this game for me. It could also make the economy of the game matter a whole lot more, as you might have to spend money to craft better decks.
I hope that Intelligent Systems does improve this game in those aspects, but the look of this game and the "mistreatment" of the franchise for so long makes me think that it's a franchise that exists just to have a release instead of something that is nourished. I really, really hope I'm wrong, but it's better to keep expectations low rather than trick myself into false hope.
EDIT: Apparently action commands are returning- the Japanese video confirms this. A welcome aspect, as I mentioned before. The action command animations are a highlight of Sticker Star. However, Mario is able to defeat two enemies at once in the battle video, a feature of Sticker Star that I personally found a bit strange. In some cases, if you use a command to defeat an enemy but still have "excess" damage from that command left over, the attack will continue to the next enemy. This is because enemy "groups" have a shared HP bar, for example, three Goombas (which have 3 HP individually) have an HP bar of 9. Not all commands are able to do this damage transfer, however. Projectiles like Fire and Ice Flowers can, but Jump commands are best used for single enemies with high HP. The interesting wrinkle to this mechanic was that enemies can alter their stance (as with the later Shy Guys in Sticker Star, who switched holding their spears from horizontal to vertical positions to negate Jump and Hammer commands) or take on different qualities- instead of Spiky Goombas like in classic Paper Mario titles, there are Pointy Goombas, which are literally Goombas folded into cone shapes that will hurt Mario if he attempts a jump. These were the more interesting aspects of Sticker Star but unfortunately woefully underused.