You can check out six of them below along with text spoilers.
• Amy marks her skin with tally marks each time she sees a Silent monster.
• Inside the astronaut's suit is a mysterious little girl. But who is she?
• The astronaut's high-tech suit was build by the sinister Silence.
• The Doctor wearing the Stetson cowboy hat is from the future.
• When Riverson spent time in the future at Stormcage Containment Facility, she killed someone. Who?
• Amy Pond is kidnapped by the Silence when she investigates Greystark Hall.
A few other spoilers:
• River Song is a human from Earth
• Canton helps the Doctor fight the Silence
• Could the astronaut spell the end for the Doctor?
Unconfirmed/Rumor: Rose Tyler, the Human Doctor (David Tennant) and Captain Jack are set to appear in a future episode(s).
Updated: Sorry, folks, but we were asked to take the images down.
Doctor Who Season 6 premiers in both the U.S. and UK on April 23rd on the BBC!