Re: 5x09 Cold Blood (Grading/Discussion) SPOILERS!!!
They killed Rory! The bastards!
There are quite a number of loose threads from this episode, like the Silurians waking up in 1000 years, Nasreen and Elliot's granddad staying behind (I hope we'll see the sequel to that someday) and the engagement ring.
I think the finale will be about changing history with the help of the crack just like the Doctor insinuated in the Weeping Angels two-parter.
"Now and then we had a hope that if we lived and were good, God would permit us to be pirates." Mark Twain, Life on the Mississippi