I'm not sure if I will play it or not. I've wanted to for a long time but I dislike a lot of the changes going on - I see it being kiddy'd down (snobby elitist bad-hygiene hardcore gamer) and WoW'd to hell
I'm not as pumped about the soundtrack as I'd like to be - the Diablo 2 soundtrack is an amazing set of music and there is a reason it costs $50 to get a copy of it anymore. Unfortunately, the guy who did the Diablo 2 soundtrack - Matt Uelman - stopped working with Blizzard. Blizzard always has and surely still will hire on world-class artists for their games, but Matt was someone special that stands out far beyond all the other Blizzard game music.
Still, what I am looking forward to most for both Starcraft 2 and Diablo 3 are the soundtracks.