Edited to add: after watching this a second time I have to say that it is worth watching to see the wonderful relationship Steven Moffat has with his precocious young son... this kid is really something special!
Here is a wonderful interview w/Steven Moffat, and I guess there might be spoilers (?)
but I didn't notice any:
Click to view
I really loved the two part finale, I think that this was a brilliant season....
well I stayed up way too late (to watch this illegally at the first possible moment)...
I'll get to bed now.