Wow. The Radio Times have posted an article on their blog previewing "The Wedding of River Song". They attended a special press preview showing - and have blogged their thoughts.
Although they SAY it's spoiler free...I don't think it is. It doesn't give much away - but spoilerphobes might want to stay away.
I'll give you the link to the article - but I won't discuss it here just in case:
Radio Times - "Wedding of River Song" - Preview
I can't wait for the finale - seriously, I cannot wait.