So the only things that are new, that I know about are shortcuts, better graphics, Vivian confirmed to be officially a trans woman, and endgame bosses

I really want to get it, but I might wait till it goes on sale. I mean I still have my GameCube version, so is it really worth the full price?

Yes you should get the remake. For me at least it's a vote-with-your-wallet situation, the better it sells the more effort Nintendo will put into any future remakes or even future Paper Mario games.

I just hope this means we will get a Super Paper Mario remake at some point. I love that game.