I can only speak for NDSU but...
Lee Vandal (Rolla) is a beast at fullback - pro scouts were on him last year already
Austin Richard (Fargo) is big and nasty at center - he has to stay healthy or the offense is in trouble
Michael Arndt (LaMoure) is a three-year starter on the offensive line - playing OT
Ryan Smith (Wahpeton) is going to do return work as a true freshman - gets his first start against Kansas
Matt Anderson (Cavalier) is finally healthy and starting at LB - he injured himself on his first play of his first game and spent his first three seasons unable to hit anybody. Now he's had a surgery that hopefully fixes that.
Brandon Jemison (Fargo) is starting at OLB after playing as a true freshman and is looking very impressive (much bigger than last year too)
Landon Smith (Dickinson) is a team captain and starting TE
I've also been hearing good things about Ryan Drevlow (Gwinner) and Reed Duchscher (Rugby) has earned a schollie at WR after walking on. The first seven guys are going to be really key for NDSU - if the Bison get production out of Drevlow and Duchscher, that'll be a bonus. Elsey Thorton is redshirting unless there is a disaster.