Looked into this a bit more, and wow, I think it looks amazing. To be honest, I wonder whether people shouted "knockoff" at Jak & Dexter or Ratchet & Clank in the past. Because those two games certainly use the same duo dynamic Banjo-Kazooie uses, and I don't recall them being hated at all. In fact, comical duos have been a trope since like forever, and you find them everywhere. Be it Pinky & Brain, Asterix & Obelix, Laurel & Hardy, Rick & Morty... Buddy-platformers just put this working premise into a game, and it's not like Banjo invented 3D platforming either. Admittedly, the combination isn't that common, but given that there are 3 games from that era that do this, it looks more like a general throwback to me.
I do suppose that dropping the backpack might be a good idea to differentiate the rabbit more from Banjo (and Ratchet), though, and perhaps the story should take care to not get too close to Crash Bandicoot Warped (which was a Naughty Dog title just like Jak & Dexter)... Oh, and the side-flip might be a bit too obvious a Mario reference for some people.