Explain, please, how this counters class homogenization. I see it forcing all druids to walk a very narrow path. We will all be shapeshifting situational healer-dps-tank-kins. The diversification by specialization allowed by the current talent trees will be completely lost in the new blended 4.3 talent bush.
Understanding the desire to only play one role as a Druid is no different than playing one role as a Paladin, Priest, or Warrior. I am a healer, I enjoy healing, therefore I am a tree. I can be a cat for a quick attack in PvP, fly to where I need to go as a big blue bird, but my focus is on healing. Blizz made some progress towards homogenization when they allowed trees to cast Wrath in treeform (but that was far enough for me:)

My GM loves to tank. His main is a Paladin with 2 tank specs. Should he be forced to use holy abilities to be a good tank? Maybe drop his shield for some quick 2 hand damage? Should our Shadow Priest be forced to heal because "...well, yanno, he IS a Priest"

Do you want to see your gear when fighting? Perhaps you shouldn't have rolled a class that changes shape (Druid) to do ANYTHING, one that takes on Shadowform (Priest) or one that relies on stealth (Rogue). The fact that my toon gets branches waving when throwing heals tickles the hell out of me and is just a huge added bonus. I still see my gear when treeform is on cooldown but I see no difference in maintaining tree or Moonkin form just as a Shadowpriest stays in evil-blue-cloudform.

@ducss750 - I think by "class homogenization," Thorngrip means a differentiation between classes, not specs. Think of it this way: If you enjoy the whole combo point/energy thing, why roll a cat instead of a rogue? For tanking, why roll a bear instead of a warrior? Why roll a boomkin when you could roll a mage? Finally, why roll a tree when you could play a shaman or priest?

In each case, a particular druid form's counter part is not only just as good, but possibly superior for the fact that they, all in all, have a larger toolbox. You could do SO many more things as a rogue than as strictly a cat. So the question becomes why play a druid at all when you have all these other classes that are just as good if not better in these certain areas?

The reason druids are special, and the thing that makes them unique is that they can dip their feet into all these areas. A rogue cant tank, just like a mage cant heal. A warrior has difficulty attacking at a range, just like a shadow priest has a tough time dealing damage on the move. Druids have the potential to do all these things, and with 5.0, we will get that chance. Its not mandatory to constantly be shapeshifting, but the option is there and thats what makes this change exciting.