I'm excited for a lot of things:
4.3" Screen - For reading TiPb :0
LCD Screen - AMOLED is invisible outside!
Real Multitouch - My Nexus' multi-touch is bad for playing Gameboid

Kickstand! - Because the iPhone can't be a bike and Android phones can!
4G - More importantly Sprint in general, T-Mobile's coverage is hard to send texts with, which makes my girlfriend...unpleasant
8 megapixel camera - Especially for capturing all the soon to be summer memories
Front facing camera - So I can video chat with my clingy girlfriend :/
No trackball - Because my trackball is "dirt 'n' jeans" colored.
Insurance on my phone! - I can't have real insurance on my Nexus with T-Mobile, I have the insurance alternative but that costs one hundred something dollars if something as simple as your ear piece goes out.