I had two conflicting interests up until 5 minutes ago, have one toon of each class and have two druids if the troll or worgen forms were totally awesome. Druid is my favorite class after all and I can only play 2 specs at a time.
Well it turns out the new forms don't do anything for me at all. The troll forms look like they belong in a circus and the worgen forms are tauren with the horns cut off and perhaps a little more hair. These are probably completely desirable traits for troll and worgen druids though.
So now I know that my worgen priest and goblin warrior will be my two new alts for the expansion and fill out those last couple classes I've been neglecting. No more worrying in the back of my head of how I will enjoy all the alts I want with the limited character slots provided. A small weight has been lifted off my pinky toe.
Edit: Added images for those who couldn't access them elsewhere.