I heard those rumors too. Nog supposedly had a staph infection or something during the Mir fight though. That might be why some people thought he looked like crap. Funny thing is, to me, he looked normal!? He's never been a dynamic striker. He's always been kinda slow with very little power using striking just to set up his ground attack. I thought Tim was beating Nog badly in the stand up until Nog pulled guard. And Tim isn't a dynamic striker either.
I think it'll be a good fight but honestly I wouldn't be surprised if it went to decision (for Couture). I will say this though, Nog looks like he's in incredible shape. Lighter and more cut than when he fought Mir. Almost PRIDE shape.