Pretty much as the Title says.
How exactly does the new physics effect the game?
From what I've seen so far samus can't morphslide pretty much at all.

I think it had already been mentionned in a video but the air mobility is different, now you can jump backwards while running at full speed.
It is not easy but for example with C.Falcon you can now run, jump in place and nair which was impossible in 9b. And its much better for spacing. You can also jump in place knee btw but that's harder and also you could just run, jump forward and knee.
This also offers more tech-chasing options.

Also I feel like you have to be a bit more precise to do instant throws, rolls, and getting up. That sort of stuff. Sometimes I stay in shield for like 1 secondes trying to roll. I can't explain exactly what but something has changed.

Overall the game feels more like Melee than ever I'd say.

I was expecting a more well informed response, with numbers. Not someone who is gonna parrot back things we've been told.
But ok. Thanks for the offering

Well I don't know about the "things we've been told" tbh so that's just what I felt like putting it in my own words