People in the comments have said the combat looks to be more in line with past games meaning no one time use items for attacks.

Also in screens and footage I see Mario having some characters by his side like a folded Bowser, an explorer toad, a bob-omb, and a magikoopa, so it looks like partners are back in some capacity. One guess I've got is maybe the partners are based on location and don't follow you everywhere, but that's only a guess so don't take that as gospel.

Please for the love of god let this one be good!