I think that we will be very surprised when and if we ever find out. I wouldn't be surprised if it is someone quite famous. Any guesses? My gut feeling is that it is someone who is supposed to be "dead":
JFK jr Tom Clancy (My No 1 choice) John McAfee
Any thoughts?
Maybe Tesla time travel?? ...as part of the Q 'team'??
Hmmm, Time Travel. In That case, JFK.