User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-62.20.183.222-20130304210524/@comment-108.216.77.1-20130304222429

What it does as far as i know is that once you hit 100 in a skill you can reset which the skill goes back to 15 and you get all the perks back, then you can repeat the process of leveling up again meaning you can reach levels past 81 increase your health magicka and stamina and you might even be able to get more perks by leveling up again