It should be noted that HP3 is Anamorphic. The deleted scenes were FF but some very nice peeps from VideoHelp taught me how to use Gordian Knot to properly do upsizing while not noticibly losing quality. I really love how HP3 came out. It took some serious figuring because a couple of those scenes were presented as "unfinished." I hated having to edit out the part of Neville losing the password to Sirius, but I was glad to find a new location for the rest of that particular scene. And then Harry's joke candy in the Great Hall ... it was fun finding a sound effect to make that scene work.
I hope there's an hour of deleted scenes for HP4. I fear there will be next to nothing. We shall see in May I guess.