I don't mind the final Cheetah design (although it's perhaps a bit ... "pale" for me and I'm not sure about her "human" hair being nearly the same colour as her fur).
But, the CGI model needs work. Even relying upon the same tricks from the first film (set at night, minimal sources of light, inclement weather effects), Cheetah doesn't seem to have any real "weight". Given the character design, I don't see why Wiig or a stunt double in a furry costume, prosthetics and makeup couldn't have been filmed jumping around on wires (and the wires digitally removed).
I fear that the climax is going to be another lackluster "video game" battle between two CGI characters.
As much as I prefer the were-Cheetah design, I would have taken an Alex Ross-esque Cheetah "suit" if it meant the final battle would be between two actors and their stunt doubles.
I do hope that Barbara's characterisation is at least as strong as Selina Kyle's in Batman Returns. From the trailer it's coming across a little too simplified - Barbara wants to be pretty and popular like her friend Diana. The line about being an "apex predator" doesn't really fit with the rest (and seems an odd thing for a gemologist who is friends with a goddess to aspire to being).