I find that I'm looking forward to the changes to the paladin class, and more importantly the population of paladins to be made of skilled players. Right now, there is a large majority of the class that play it because it's easy.
Or I could say that I'm excited about entering the world on the first day. It will almost be as awesome as when I first started playing on my Night Elf Druid. Seeing those giant, powerful Ancient Protectors that I used to command in Warcraft III almost brought a tear to my eye.
There's also flying. I don't think I'll spend the first day leveling, but flying in and around Azeroth. Probably on the day before, I will create a list of sites that I would like to see.
Finally, if I get a beta invite, I would be most excited to give my thoughts and opinions on the Protection spec of the Paladin. I've been playing a tankadin since BC when it became viable. It started out from the love of grouping up tons of mobs, then watching them die as they kill themselves. In the meantime, my health would be topped off from my seal and judgement of light. I still use this advantage to solo certain bosses in BC and Classic WoW. With my understanding of the class, I hope to help create a more complex and difficult Tankadin.
Anyways, thanks for this contest Zam. Now that I think about it, the thing that I'm most excited about really is the:
http://www.pollsb.com/photos_handler/o/45499-top_hat_wears_best.jpg