I just have to add here, I hope that the dragons of this movie are based off Michael Whelan's covers. This is a great example:
Michael Whelan Gallery Detail
His vision of the dragons of Pern were the most natural and beautiful I can hope to see.
Please, movie producers, don't add big shiny scales, fins, hair, ears, big-beefy-arms, troll-fangs or silly human-like faces to these dragons. I think my head would implode.