Here's my quick take on the matchups and how they've changed from the patch:
Aquaman: 5-5
KF can't approach a patient Aquaman with slide or air dash due to b1 check vs. slide and his amazing d2. b13~ex trident rush is a serious problem for everyone, including KF. Aquaman has to play this match differently, but b1 and triden rush get the job done. Interactable changes don't affect this hugely since Aquaman doesn't have the extreme mobility of other power characters.
Bane: 6-4
The venom upgrade isn't as big of a deal as I thought. Uppercut MB on wakeup takes some getting used to, but it's not a problem after that. It just makes Banes use meter, which cuts his advantage in the second round. I think this matchup barely changed and remains 6-4.
Batgirl: 6-4
D1 becoming parryable is a huge change IMO. It massively weakens her frametrap pressure from d1~bf3 and d1~cartwheel. It completely changes the post-slide game - now she can't d1 into pressure for free, she has to use either d1 (parryable now) or b1 (our d1 interrupts).
Batman: 5-5
This matchup hardly changed at all. The trait nerf isn't a big deal since he can regenerate it while having other bats loaded up - trait management makes it a nonissue. Punishing annoying whiffed b23s is nice but ultimately doesn't change much.
Black Adam: 6-4
I haven't played any yet, but I don't see how this isn't in KF's favor now. She can punish both ex lightning and black magic on reaction now. He can no longer abuse divekick to backdash, as that'll make him eat a 50/50. He now can't outzone her and continues to lose up close.
The dynamic for this match has turned completely upside-down. KF can play patient and smart and frustrate Adam into coming in. One bad divekick can kill him. I don't see, now that he can't reliably zone her, how this isn't in KF's favor.
Catwoman: 6-4
We need to be a tad more careful with our daggers so that she doesn't predict it and ex cat dash in. It's still the same as before though, now she can armor a little later and punish the daggers after they've been thrown rather than catch KF's startup. Catwoman still has the onus of making the guess and loses meter and possibly enters the vortex on an incorrect guess. KF still probably beats her up close, sporting one of the only d2s that can deal with Catwoman's j2. The changes might catch KFs who are used to chucking a ton of daggers off guard, but after adjusting it's still in her favor.
Cyborg: 6-4
Cyborg apparently got a big damage upgrade midscreen due to the 3d attack interactable buff, but we tend to force him to retreat to the corners anyway. Be more careful with slide at midscreen and this stays the same.
Deathstroke: 6-4
Nothing new here. Trait changed a bit but ultimately won't swing this matchup back to even.
Flash: 6-4
I always thought this was 6-4 to begin with. He suffered a noticeable damage nerf on his midscreen and corner bnbs and lost a lot of shenanigans with his d2. Yeah, the first time he touches you it'll hurt, but you can out-footsy him at mid screen and get some zoning in if you're outside of LC range. This matchup becomes a lot easier when you realize his only option after blocking d12 is f2 due to the bad range of d12.
Green Arrow: Unsure
I don't know enough about how the stinger buffs work to comment.
Green Lantern: Unsure
I don't think the OTG nerf hurt him that much, but I also don't have an opinion on what this matchup was pre-patch, so no comment.
Harley Quinn: 5-5
I think this was always 5-5 (note that Harley was the character to eliminate the hopeful KF top-8 players in two majors), but I don't think the patch changed much here. I still have to look into it though.
Hawkgirl: Unsure - I haven't looked into her changes
Joker: Unsure - he changed too much to know right now.
Lex: 6-4
We still beat him at max distance despite the lance shot buff. I don't think this match changed much at all.
Lobo: Unsure - he's almost an entirely new character, will have to see. Probably not 7-3 anymore with the new shotgun blasts doing 28% on hit and over 7% chip.
MMH: 4-6
We have less options vs. TP now, otherwise the matchup hasn't changed. Interactables becoming weaker generally is helpful but likely not enough to push it to even.
Nightwing: 6-4
No relevant changes here.
Raven: 6-4
No changes.
Shazam: 7-3
I think Shazam still sucks hard. I didn't even notice the damage buff or grab range buff (FYI, HM always could grab from starting position), and he lost his crazy corner damage.
Sinestro: 7-3
He got a nice buff that's relevant against everyone but KF. Gotta love parry.
Solomon Grundy: 6-4
Trait becoming unparryable is almost completely irrelevant - just jump. I guess parry doesn't cover almost every option except his low starter, but we still win up close for sure.
Scorpion: 6-4
He got a small damage buff, not enough to make his vortex a 3-touch kill, and he still has to spend way too much meter to do anything. Still 6-4.
Superman: 5-5
I don't think this matchup changed much ultimately. F2 still has decent range and he still has the air control that gives KF problems. He doesn't outright kill you right away once he gets you into the corner, and air laser is easier to punish from anywhere within slide distance. Superman can play the match mostly the same, with the only very noticeable change being his corner damage. The jury is still out on him, but I think it's the same.
Wonder Woman: 5-5
Interactable nerfs help KF, but the matchup itself stays mostly the same. She just can't be as annoying on stages like rooftop.
Zatanna: Unsure
I still think we don't know what Zatanna looks like on a high level. She did get a noticeable nerf though (no more j2, float cancel j2 combos).
Zod: 5-5
We can't parry trait anymore and he lost damage. Likely roughly the same.
