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?
There is no way it could possibly mean anything. Time is not a continuum. There is only the ever-evolving present. Thermodynamics forbids anything to be reversed (forbidden decrease of entropy). The only way to travel to the future is by taking a Long Sleep (and hoping you wake up). A lot of people have been seduced by H. G. Wells' assertion that time is a dimension, but we don't experience it that way at all. There are innumerable paradoxes with time travel---and paradoxes never exist in reality (ergo, time travel is not part of reality). This wasn't helped by Einstein's innovation of "spacetime." Just because you can plot events in 4 dimensions does not mean that time is a continuum.
I've read 60-odd years of science fiction, and I've seen it all. I've also followed a hard science career for 50 years and learned the limits.
Pfft. You'll never create the Flux Capacitor with that attitude!
It was never meant to be, mon cher!