I've been saying for a long time that I wouldn't mind it if Wonder Woman wears a cape, not all the time like Batman or Superman, but occasionally. Wonder Woman has been known to wear capes before.
If this concept art is accurate or legitimate, I'd say it's pretty much a given that we'll be getting a live action shot of something similar to this ↓ in Batman v Superman.
And to think that people accused Man of Steel of having too much cape-porn, and now it looks like we're about to see an exponential increase in long, majestic, flowing cgi capes in the DCCU. I think it's great. Interesting to see though that they decided on a blue cape and not a red cape, but that's probably to distinguish her from Superman.
So we'll get Superman - red cape, Batman - black cape, and Wonder Woman - blue cape.