In Oblivion, monsters had levels within the monster type. Skeletons had: Skeleton, guardian, hero, champion. Are monsters in Skyrim going to have more levels? I wouldn't be surprised since your character will probably reach higher levels in Skyrim, and the monsters need to keep up.

That would make sense. The game has a lvl 50 soft cap. Meaning you get to lvl 50 at a moderate pase. But once you get there it starts taking longer to lvl up. So we'll see.