It's definitely been a big request for a long time, and surely even the devs have seen the awesome work of artists like Andrige to update and enhance the models currently in the game. Zarhym says artists are "very actively working" on redesigning the Druid models, and that "it's way beyond being an idea at this point." He doesn't think they'll show up as soon as 3.1 (and neither do we), but he says that it's in progress. You have to think, then, that there's concept art, if not working models somewhere ready to go into the game in the future. Excellent news for Druids seeking a slightly more updated look than what they've had since the game began.