BBC America has unintentionally dispatched box sets of Season 7 Part 2 to some fans who've pre-ordered the box set, meaning that The Name Of The Doctor, the season finale, has already been witnessed by some American fans.
The news was confirmed by the BBC and the official Doctor Who twitter said "The #DoctorWho team would be hugely grateful if fans helped keep spoilers off the net."
There has been some cynicism that the leak was a ploy to get the hype up around Doctor Who to boost the ratings for the finale.
As it stands however, it seems that anyone who is a fan enough to order the Blu-ray box set on pre-order hasn't ripped and uploaded the file to the internet. As well as that, BBC have promised this on their facebook page:
"If everyone keeps the secrets safe until next Saturday we will release a special new clip featuring material of the Tenth AND Eleventh Doctor!"