Doug McCrae said:
I really like the look of the 4e druid because it focuses more on what is unique to the class - wildshape - rather than the spellcasting which currently has a lot of overlap with wizards and clerics.
Why not make a druid's spellcasting more unique then?
-They could be the only spellcasters that can magically affect animals in any way, whether charming, communicating, summoning, etc.
-They could also be the sole users of spells that deal with weather like controlling weather, summoning violent storms, manipulating the winds, etc. The wizard could create a highly damaging cone of cold, but the druid is the one that could summon a violent snowstorm in a medium-sized area that would slightly hurt enemies, slow their movement, and obscure their vision.
-The druid could also be the only class with access to spells regarding fey and the Feywild. It seems like a natural fit.
-Spells involving trees and plants could be expanded on. Entangle is a nice unique spell early on for a druid, but maybe later on he gets access to greater versions that cover a larger area, affect more creatures, cause damage due to strangulation, or inflict poison effects from poisonous barbs. If there's a half-dozen different wizard spells dealing with an invisible hand, there certainly can be a half-dozen druid spells that involve effective use of plants to entangle enemies.
-And then there's a ton of unexplored area regarding nature spirits and the effects a druid could cause using them. They could be used as various unique buffs/debuffs for friends/enemies.
Combine all of this together, and a spellcasting druid has incredible potential to be an awesome controller, and the class would be very iconic, very flavorful, and it would clearly have its own niche without really taking anything important from anyone else's niche.