Herra, should i remind you of that both Einstein's GR and SR Theories are almost a century old?.
By the way.. Tachyons "within" open strings look quite promising and interesting to me. Although today, these little faster than light frakkers are still labeled as hypothetical particles by the Scientist community

.
Although Einstein's Field equations predict related efects as Frame-dragging, I'd point to String Theories ( yes, plural.. unfortunately many variants of the original.. ), Hawking's Quantum Fields and the amazing properties of BECs ( yep, Einstein here again.. all my respects to the master! ).
Talking about time travel to the future. The relativistic time frame for a faster traveller looks like some sort of "cryostasis" to me as well as some sort of fake time travel. You catch me at this one?. There's much to discover and much more to know and, being not this the better place to discuss on these matters, I foresee that travelling backwards is possible, teleporting is possible, cloning particles is possible, space jumps too... and the list goes on.
The only thing I'm afraid of is if we, being as hostile as we are, will deserve the required technologies to fullfill these challenges in the .. yes, the future

In other words, I prefer your first interpretation !
