At first glance, the new draenei model doesn't seem as different from the old one as the tauren or orc models, for example, but this is to be expected. The original draenei (and blood elf) models, implemented in Burning Crusade, were a significant step up from the models of classic WoW. That being said, there's marked improvement in these previews. The hair, the detail of the leg musculature, and in particular the hands all give our beloved draenei much more depth and finesse in the body. The curvature of her head-tentacles is also much smoother and more realistic-looking. This is a nice upgrade from the current draenei, and I look forward to seeing more.
New character models