We've known that it's not going to be Harry or You Know Who for a while.... so the question becomes.... ¿quién es? I don't know about everyone else, but I was left a little confused at the end of OotP, with the thing with Neville and the prophecies and all that. I feel like I was bombarded with too much extra information that made things needlessly complicated. I hope that HBP clears some of that up.
I can wait for it, though. I'll probably get a little more hyped as the due date approaches, but... yeah. I own all the books on paperback, not hardcover, so I can wait before I read it (and own it).