Reanimate? No, they could make a new version with Dr. Halsey's brain, assuming Parangosky lets her, but it wouldn't be the Cortana we know and love. Kind of would like to know who was questioning her at the beginning, though. Need to go back and re-watch the opening.
Interesting theory, though: Cortana mk I survives, but they don't know that and outfit Chief with a new flash cloned-Cortana (Mk. II). Cortana Mk I and II meeting up would be interesting. Especially if Mk I or Mk II is rampant.
I'm going to go kill someone at 343 Industries now.
Which, PS, is one of my highest accolades for a game.
>.> Too long until the next game...