They did a remodel back in 2008 that brought the capacity up to around 92k. They typically cram a few thousand extra in there so it could be around 96k today.
One of the biggest weaknesses of a Bob Stoops team is that when they get a two touchdown lead, the coaches and players think the game is over and let up.
I really don't think OK is all that good right now. Too many defensive players find themselves totally out of position and the offense seems to "run out of gas".
A really talented...and well-conditioned...team (such as Alabama) would be able to beat OU handily. Thankfully, there is still time for improvement.
Having said that, I am happy with the 5-0 record so far.