I’m almost positive this is the exact same artwork with a different background.
The image on the left is from a 2015 illustration while the middle image is from 2016 SDCC. They could have easily masked the character for the illustration.
There are some differences but one has lighting effects specific to the illustration while the other is a picture someone took of a screen (it’s probably at an angle and low-res). I also had trouble finding the exact size and angle. Either way there were enough similarities to make me suspicious. Even the top of the SDCC image is cropped at a position and angle that would hide the lock of hair.
If that’s the case then I doubt it can be denied the character looks like Chloe. Sure the hair is different but so is Chat’s. It’s also possible that both these images are just old concepts that are subject to change for the final product. Like the peacock kwami.
Of course there’s always the possibility of a new character. If nothing changed then it’s also possible the wielder is another character from old concept art, and that their coloring changes after transforming. Then again it would be odd to show her miraculous coloring in civilian clothes.
This is just something I found curious and decided to put out there. We won’t officially know anything until we see the final product ourselves. I can’t wait to discover the facts!