I personally think the Texas football will be better at positions in which players decided to go pro. I know the defense will be better without some the past starters (Killabrew, Derry, Jackson, etc.) and a great defensive coordinator.
RB- Jamal Charles has great talent, but I think the current RB's fit much better in the system. Jamal Charles dances around too much, and doesn't hit the holes hard. Jamal took away his best attribute (speed) by not hitting the holes, which put defenses at the same speed as him or faster.
TE- I think J. Finley was more of a me type player. Blaine Irby will be a better team oriented type TE, and reminds me of David Thomas. I remember watching both players at the Baylor game last year, and Blaine Irby really impressed me. He was trying to pump the crowd up the entire game on the sideline, while J. Finley was lounging on the bench in between series (not into the game at all). Irby also has some good plays throughout the season.
LB-I don't have to say anything here. We all know we will improve greatly this year here!
DB-S- Texas has some of the best young DB's and S's in the country. We will improve here eventually, hopegully by the time we play ou.