And now, I've stumbled across some breathtaking production art for the promising-looking picture, posted on a French blog called The Art of Disney Animation. Judging by all the sweet art on this site, it seems like it's run by someone who actually works at Disney (does anyone in the House of Mouse know about this guy??).
Check it out:
That Rabbit looks like a dressed-up refugee from Watership Down. Which is a good thing. And how about those giant, grotesque Tweedle brothers?
For even more of the production art, in much larger, high-res versions, check out the original site.