I am sure my post will echo a lot of people, but I am definitely looking forward to playing a Worgen druid. I currently have a night elf druid who is a tank/boomkin. I can't wait to start from scratch again with all brand new starting quests. Plus I want to make this new druid a tree/kitty, so I can still have the fun of a druid, but with a whole new spin on it since it will be totally different than my main.
Plus it will be great to have all new quest lines and adventures to partake in. The current quests we have are nice, but when you've done them 10 times, it gets old. New starting quests, new (old) areas to explore, new adventures...I can't wait!!!!!