The Canadian trailer shows the Doctor telling someone you just died, and the BBC One trailer contains the line Its already happened. You just witnessed your own future. Add to that that both trailers show the Tardis moving incredibly erratically and seemingly being sucked into a vortex amidst flashes of lightning, and it looks like Steven Moffats love of wibbly-wobbly timey-wimey plots is back in force. Admittedly, given that the episode is Amy and Rorys farewell, its pretty obvious that the lines about dying and the future coulld refer to them, but if theres one thing that the Who killed all the Daleks scene from Asylum Of The Daleks showed us, its that the people who make the BBC trailers are sneaky sods and that we shouldnt trust them.