More visual customization, preferably with forms independent of caster form looks. Different forms in particular would be lovely, probably easiest to incorporate into the current system with minor glyphs. Where has the stag travel form gone? =P
More class-specific quests. The flight form questline in BC was a great way to make players feel that there was something more to their class choice as their role in Azeroth is concerned besides an interchangeable spot in a questgiver's "Thank you, <class>". More quests that highlight or rely on particular features of a class.
Shifting out of roots in PvP. ;)
What spells do you use the least?
At first, I was going to say Hurricane like many ferals, but then I thought about it, and...
Wild Mushroom. And it's kind of sad, because I really enjoyed the idea of it when I first heard about it and made plans to use it in my tanking and PvP. But having to shift out of forms to use it is a deal-breaker. Sure, I *could* prime the chokepoint that the adds will rush through and give them a face full of spores and a serious urge to kill me...or I could stay in bear form and not let the boss rip my head off and stuff it down my throat. It's a very interesting and quirky spell that requires ferals to take a potentially deadly functionality hit every time they try to use it. I suppose it's not so different in this from most other druid spells, I was just hoping it'd work in forms, like Faerie Fire.
P.S. I have no idea why people don't use Teleport: Moonglade more often. o.0 It's extremely handy for getting around for Archaeology; it's an easy alternate way of getting to the Molten Front dailies or Darnassus (though it's not like anyone ever goes to Darnassus =P); it's just generally a convenient stopover for repairs and selling off trash if your hearth is on cooldown.