I never forget a face.
Tráiler para TV de The Time of The Doctor, el último especial de Navidad de Matt Smith
The Day of the Doctor, leaked trailer
You are a whovian on a work related trip. You walk around a gallery in London. You meet Amy Pond. You die.
So, after the TARDIS falls to Trenzalore, one of its windows cracks. Irrelevant as it may sound, just a scene later we see The Doctor’s tomb, which, as he explains, is the same TARDIS.
This one has the same crack, maybe pointing to the fact that The Doctor’s final battle may not be as far in time as we think.