One of the promo posters shows what many people think is Hakeev. Now we know that he died in the Cloaked Intention FE series but *if* the start of the Romulan missions is set chronologically at the same place the Fed timeline starts then Hakeev would still be alive. (Sela would also have not been captured/rescued by the Iconians, Obisek would still be a terrorist/freedom fighter etc.)
I think this would be interesting to build up his back story and make him a prominent villain in their story. Perhaps we might even get to see how Hakeev got his borg implants?
While they are at it, could they possibly re-do his voice in Mine Enemy. He sounds quite different to the last 2 episodes and its kind of jaring to have his voice change.