I imagine Chun will at least be mid tier. Fwiw I personally put her at low but not bottom in season 2 (Ken, Juri, Fang, Kolin, Nash, Alex, and Ryu in that order are the characters I consider to be worse than Chun).
All of the universal changes work in Chun’s favor. She will have some of the best post-throw oki in season 3 and many brainless VTs are getting nerfed; she has always kind of played against the concept of VTs, but seems to be getting two good-to-excellent ones going into s3 anyways. Her individual buffs are moderate at best but they will count. Air legs is still not a great anti-throw option, but it is serviceable – I don’t like using it but Filipinoman made the point that unlike other throw baits it dodges or beats defensive buttons – but the really big part of the buff IMO is that it is now much more rewarding if you use it in neutral to hop over a fireball or very horizontal poke such as Juri’s st.hk. CC f+hk is pretty good, not a world beater as it is not exactly a move you can fish with but I wouldn’t downplay it. I personally get a decent amount of ranged ch’s with it as it is. (Edit: it’s actually not really improved as a meaty because if someone does a quickrise wakeup button into your meaty f+hk, you already get a full cr.lp combo on them. So I’d look at the change in terms of neutral only, not pressure.)
The b+hk change is interesting. I’ll need to see it in action to properly assess it, but given that it is an aa that gives you a fantastic left/right mixup even on trade it has huge potential. If it’s a functional anti air that can beat crossups and divekicks, and VT1 gets a 15+ second timer (admittedly two pretty big ifs), then Chun pretty much has all of the tools she needs to be high+ tier. [Disclaimer: Yes, obviously dependent on how different the final changelog is, this is speculation based on what we have.]
Also small thing but @Dime far range ch f+hk generally links into cr.mk. it’s still a very good buff though to be sure. Also elaborate on b+hp cc - does it build more vmeter than st.hk?