Give it time. There are a couple of videos already on Youtube (type in "harry potter and the escape from gringotts") but they are of poor quality. Also keep in mind since the ride is 3D it will be difficult to get a good video of the ride anyway.
Yeah, I would imagine a higher quality video will eventually come online, but either way, as toonaspie pointed out, it's 3D based, so it would be all blurry and what not nonetheless. Also, it's a roller coaster as well. So, when you won't be focusing on a blurry scene, you'll be moving quickly.
I just got back and the ride was fun but it was more visual then thrilling. When I watch the movies it looks like they could have made a seriously awesome and scary roller coaster, and in reality it's probably more of a kiddie or family roller coaster. But the visuals are great, probably better then The Forbidden Journey.
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