I think you're overrating how difficult it is to react to sweetspot up-B, grab ledge, and roll.

My opinion on how Kirby should be Buffed/Nerfed:
+Dash attack travels a longer distance
+Jab has a finisher (like in SSB4)
-Throws no longer let Kirby and the victim go off-stage
+Grab is faster
-Up B meteor is weaker at lower percents.
-Up Air does 2% less damage
-Fair sweetspot and sourspot does 2% less damage.
+Inhale immediately ends when you let go of the "Special Move" button.
+Fair and Bair have more knockback growth

So is Kirby's new sprite art the cutest thing ever or is Kirby's new sprite art the cutest thing ever

Both.
I also like his colors, specially the Meta Knight one (which by coincidence, it's identical to the one seen in Kirby Fighters/Fighters Deluxe, even the black eyes.)

Has Kirby been changed at all? If so, could I get a list of changes, please?

Only the pixel art as far as I know.
Also, seeing how pallette swaps can now be inverted (see Sandbag's black costume or Pac-Man's Blue costume), I think it would now be possible for Kirby to have a Shadow Kirby alt from Kirby Fighters.
I REALLY should stop talking about costumes.

Well, gameplay wise a lot of his moves such as the tilts, U-air and u-smash have more range, except for Final Cutter, which has less range. That's all I know, honestly.

why

why the ..

why is her(no his ) up-b nerfed

isn't she bad enough god damn

Dood. Kirby is a he.
All the Kirby games call Kirby a "he". All Smash games acknowledge him as "he".
Just because Kirby's pink doesn't mean he's a she.
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Anyways back on topic:
Kirby looks buffed from what I've seen from the stream, hopefully he ranks a bit more in the tier list?

I think I saw dash attack as a potential kill move on Thursday?

Well the Up B spike was overpowered and can kill at 0% if it sends them downwards offstage.

I made it as a joke actually, see how I said "no his " and then immediately said she?

I don't understand why Kirby is so low on the tier list. His recovery is amazing aand allows him to gimp characters like DK, Mario, and Ness.

Well, Kirby doesn't have good defense options. (Heck, his getup attack literally gives no damage.) Also, he's a floaty lightweight, meaning he can be killed really easily.

However, I think he should be a mid-low tier after some of his representation in tourneys. Thank TyranitarLord for that.

Kirby is super scary once you realize that he can wreck a ton of characters off of nearly nothing. (I'm a Fox main, so I've certainly had this problem.) It becomes a lot less scary when you realize that Kirby can't do anything to you unless you let them hit you. The only move in his kit with enough range to trip you up is Inhale or maybe dtilt for some characters, and both of them are unsafe on whiff or on block (depending on your reactions). Bair is unsafe from above and below and on shield, utilt is unsafe on shield and whiff and doesn't even have too much range, etc., etc. He is also brutally light and floaty, and so is very liable to early deaths from powerful kill moves.

Just don't go at them. If you have a projectile, use it. The only other thing to be careful about is Inhale: you need a plan to beat it, whether it's a move that hits Kirby coming in, roll behind, jump behind, whatever. If they go to the ledge, just wait: they have to come to you eventually. There's no reason to challenge Kirby because the risk-reward isn't in your favor, unless you can guarantee a win.