A 12-0 record will probably do it. A 14-0 record would erase all doubt. We would even get in with a loss in the next three and a win against OU.
If this team pulls out wins in the next 4 games, I could easily see us go from unranked to ~ 15.
All that said, I think it puts the cart well before the horse. We will see if this team is ahead of last year's and how far with a win tonight.