Aaron Hernandez didn't participate at the combine due to a bad back, but he was very impressive at Florida's pro day. He ran a 4.56 40yd dash and benched 225lb 30 times. He's 6'2" 250lbs. I wouldn't be suprised if the Pat's line him up at receiver as well as TE.
Check out his highlights.
http://www.sbnation.com/2010/3/10/1366058/nfl-draft-2010-aaron-hernandez-florida-tight-end