Don’t click below if you haven’t seen the episode. I’ve found a visual spoiler.
It’s related to the well-known fact that Craig Owens (played by James Corden) will return in Series 6.
UIPDATE: must-read review at Tor. No spoilers.
Screenshots from series 5’s episode, The Lodger:
Screenshots from series 6 episode 1, The Impossible Astronaut:
Also, my speculative thoughts:
– the silent aliens – called “silents” by fans already – seem to have a similar voice to the one which mysteriously intoned “silence will fall”. The fanbase pages have already made the leap that these are teh same aliens (“The Silence“) who made the Tardis explode (and likely the missing pilots for the proto-TARDIS above Craig’s house).
– the 1100 year old Doctor says right before he goes to meet his death, “Human beings. I thought I’d never get done saving you.” This implies that his death is a sacrifice for humanity, yet again.
– River alludes to (her-timeline) future meeting the doctor who won’t know her. That was of course the tenth Doctor in the Library. River forbodes her own “death” on that episode.
– a while back, River says she was in jail for murdering the best man she ever knew. I immediately assumed she would kill the Doctor. Recall her face when teh Doctor grills her about who she killed, to demonstrate his lack of trust in her. Putting this together, I speculate that person in the astronaut suit IS River Song. However, it’s not a child in the suit:
clearly an adult. look at the arm and hand, relative to later with the girl in the suit:
plus the girl is clearly shorter than the adults (from the “next time” preview):
Is the girl River Song? It is possible, since River herself says that teh astronaut stuff in 1969 is “probably” related to the one in Utah who kills the Doctor. This could be the start of the origin of River which was promised by Moffat for this season.
A wilder and wackier theory is that River is actually Amy and Rory’s (well, Amy’s anyway) daughter. But that is just way out now 🙂