I don’t want to give away any spoilers to those who want to wait the 3 weeks to see it in the US but here are my thoughts.
The episode was absolutely nothing like I expected.
I always liked the character of Rory, I liked him even more after this one.
The tone was the exact opposite of the previous episode.
There was an Inigo Montoya Moment and a side reference to something from the Princess Bride.
There is a significant contradiction from a particular 5th Doctor episode that will have to be explained or resolved.
Something happens in this episode that has never happened in the 47 years of the series, thinking back it’s actually amazing that it has never been the case.
Alex Kingston has the best part in television.
I absolutely loved the ending.
Da Techguy's (no longer backup) Blog 
Being that I don’t know the entire Doctor Who history what where the 2 things that you mentioned:
“There is a significant contradiction from a particular 5th Doctor episode that will have to be explained or resolved.
Something happens in this episode that has never happened in the 47 years of the series, thinking back it’s actually amazing that it has never been the case.”
Since I don’t want to give spoilers for those waiting I’ll privately e-mail you the answer
Thanks, I look forward to it.