GoF, using puppets??
Hey there! Just an odd little piece here that was found. It seems Backstage.com has done a little piece on a man by the name of Basil Twist. He is a 'Puppeteer', and gave a phone interview on his views of his trade.
Why would that be interesting to any Harry Potter fan? Simply because it was said that he has done some work on the one currently being filmed. So that you won't have to read it all, as there was only a small piece, I'll place it here:
Twist's work has received Bessie and Obie awards and two Drama Desk nominations, among other honors. Twist served as underwater puppetry consultant on the most recent "Harry Potter" movie.

What's this mean? Well, to me anyhow, says that at least not All our Harry Potter creatures will be total CGI, which would actually be somewhat of a nice refresher.
Anyhow, that's all that was referred to on HP, just that he worked on it. So make of it what you will. ;)