I'm so excited about the unconference, although I don't know how our wider attendees will take to it as it hasn't been done before locally. In order to include as many people as possible (and to keep the admin overhead to a minimum) we'll schedule during the conference, on a first-come, first-served basis. This avoids the in-crowd getting voted into all the slots in advance; the uncon is for everyone to take part, not just for the people who are already well known!
The unconfernece will also give spaces for those ad-hoc conference sessions if there's a demand for more information about a topic than a speaker (or other attendee) could previously provide. So, if you're planning on attending the conference and weren't accepted to the official list, bring those ideas with you and see if you can get them into the unconference!