Oh my god! A retcon of the destruction of Gallifrey and that Smith is the 12th not 11th, Tennant 11 not 10 and Eccleston 10 not the 9th Doctor. Making the Doctors life almost up with his next life, but I'm glad they didn't retcon McGann into oblivion as was the rumors going around that Hurt's Doctor replaced McGann's as the 8th and "Time War" Doctor.
Humor was fantastic too, it's such a shame that Tennant and Smith's Doctors couldn't be together more, they have some great chemistry.
Also if you saw it in cinemas then you got a sweet into from Strax and the 3 Doctors!
3D was top too!
Considering that at the end everyone was clapping, and that there were many a laugh and joke at references, I'd say it was a success!
Can't wait to see where they go with recovering Gallifrey! Seeing as now the Doctor is at the the end of his life after Smith regenerates, I'd bet money on the Doctor going on a quest to find Gallifrey and be rewarded with another set of regenerations by the Time Lord.