I know most people didn't believe him, but Sullinger's said he's coming back all season unless he won a championship. After the season, he and his father both said that the impending lockout didn't influence his decision at all. I'm pretty surprised by Barnes' decision. He played really well towards the end of the year. UNC could be scary next year, especially if Henson stays too. This link hasn't been updated in a little over a week, but it does have some good information on early entrants:
http://www.nbadraft.net/2011-nba-draft-early-entrants