the 50th Anniversary special just got twice as awesome. And apparently, they've just finished filming a recreation of the policeman's walk past the I.M. Foreman's sign!!!! (no word on whether it was a modern policeman or the classic bobby)
There's been no sign of the delightful William Russell on set (I'd be more excited to see him in the anniversary special than David Tennant, to be honest) but we've had stunt Clara riding the anti-gravity bike. Also, they're filming just a few doors down from Martha Jones' old apartment from series 3, but no cameras are pointed in that direction, so it's probably just an area that the location manager likes.