PotterCast Had An Interesting Point…

I was listening to PotterCast #64 last night and they had an interesting point about Voldemort. In the HP5 trailer, which was just made available online, the clip of Voldemort looked old. It looks as if they used, for the trailer, a clip from Goblet of Fire. Why would they do that? Does Voldemort look a lot different? He could be unrecognizable, or WB may simply not want everyone to see what he looks like now. Another possibility is they don’t have any scenes with Voldy that are finished to the point where they could use in the trailer. Weird?