HAYHAYHAY!!!
The world will only end if the Doctor fails. And I believe in the Doctor! I believe in my Raggedy Doctor! >:o
River will appear! I know she will, because she already did! (NB: River's personal timeline is in reverse to the Doctor's... the first time they met, she died, the second time she said that she will see him at the Pandorica, so the third time has already happened for River.)
Are you confused yet?
The cracks in time have been slowly destroying everything they touch... two moments in space and time that were never supposed to touch, and yet seem to be stalking the Doctor wherever he goes, whether it be the world of the Weeping Angels, Starship UK, miles below the earth in our future or behind the fridge in a flat in London. What is their intention? Who is imprisoned within the Pandorica? And what does this have to do with the Doctor?!?!
(And will Amy ever remember Rory again? :( She forgot him when he disappeared through a crack after being killed by a Silurian.)