I’m seeing some buzz that Ben Mendelssohn’s officer character may in fact be the old EU’s Armand Isard, who was re-canonized by the Tarkin novel. Someone connected to Lucasfilm (I forget exactly who) hinted that we may have seen him before on Twitter yesterday.
His outfit sure looks cool (we have never seen Grand Admiral before in live action). The actor has an interesting “Cushing-like” face. Could be a good vilain for once.