User blog comment:Mesi99/What mean the dream than eren see in first episode?/@comment-25179257-20140715102608

In the first chapter of the manga, Eren is dreaming about the future. Mikasa says "See you later" and Eren upon waking then asks if her hair got longer (whereas she hasn't actually cut it yet.)

Given that chapter's title, "To You, 2,000 Years in the Future", it would seem to indicate to me a cyclical world. Eren and Mikasa died 2,000 years ago (Eren remembers it), and now the story restarted.

The idea that somehow they invent a technology to send Eren's mind into his younger body to change the past, X-Men Days of Future Past-style is more outlandish given that the story hasn't shown any evidence of psychics or time-travel tech. Although, I guess Eren is pretty similar to Wolverine, though it wasn't Wolverine in the comic version.

But I have no idea how that would jive with the recent chapter and Eren's memory of that woman.