Could see them before then, but they'd both have to fall to 4th/5th to play in the BWW bowl. Or NU get's an At Large and OU bets the Auto Bid to the Fiesta.
It's not "official" until it's "officially" posted on the HuskerHoopla board. So in all theory you either incidentally missed a link in the chain of command, or you were too skurred for OU to make it "official"
The appeal of that matchup has dropped significantly over the years. I know quite a few people who feel like I do about this. Games against Alabama, Georgia, LSU, Florida, or USC would be more appealing, but with Bo's history against top notch competition, even games such as these aren't quite as appealing.
I was really disappointed when Arizona beat USC back in 2009. A Nebraska USC matchup would have been much more appealing. That would've been great to see some revenge for all those whippings Nebraska had to endure against them! lol