In 2011, Saturday sold out. AFAIK that was the only year any day had.
Do you know when it sold out? I recall still being able to get badges the week of - maybe it was a few days before or day of?
Let's hope the set up is a bit better this year - lots of wandering trying to figure out where some of the panel rooms were. The exhibit floor was great though - wide open aisles to walk w/o feeling like in a mosh pit and still plenty of room for the exhibitors.