I've seen the spell lists so far. And if I understood the changes to spell selection it's being changed to spells being fixed to the spell slot level. For example with 3 level 1 slots and 2 level 2 slots available you'd have to pick 3 level 1 and 2 level 2 spells rather than 5 total spells between all the 1st and 2nd level spells. I don't remember seeing anything about upcasting so far either. Makes me wonder if spellcasting is being rebuilt from the ground up.

I'm pretty new to this and have only played some one shots in the past. Right now I'm mostly doing character concepts and campaign/adventure settings. It seems to me like they've deconstructed the game and are rebuilding piece by piece.