Today, it was announced that CSI: Miami star Megalyn Echikunwoke has been cast as the live-action version of Vixen in the ever growing Arrow universe on The CW. Megalyn Echikunwoke actually voiced Vixen on the digital series which debuted on The CW: Seed earlier this year. That digital series is considered cannon alongside The Flash and Arrow but who knows how much will actually be referenced in the live-action show.
Arrow showrunner Marc Guggenheim had this to add about adding Vixen to the show:
“We’re not only thrilled to be further expanding our DC television universe by bringing in the live-action incarnation of the CW Seed hit, Vixen, we’re immensely excited that Megalyn will be revisiting her role as Mari McCabe.”
Arrow returns to The CW in early 2016