In addition, Coming Soon! also got a small set report from the scooper:
"Shooting on the third Harry Potter is underway already at Leavesden studios - A local road has been closed for about 12 hours a day for the past few days. Got some pictures today but unfortunately not much going on during daylight! When it gets dark those huge cranes lift lightboxes into the air to illuminate an area (I would guess) around 50 square metres. Not sure what exactly they are shooting as it is impossible to get very close. Have tried taking some night pictures (the cranes can be seen for a good mile or so) but they look very bad! I will try to get some around dusk today or tomorrow, assuming the lighting is up. Also, something is being built and stored in the back lot, hard to say what though."
Dont't forget to also check out: Harry Potter and the Prisoner of Azkaban