Like a thieving Khajit with a Sneak skill of 100, Bethesda have surreptitiously uploaded Skyrim's Legendary patch onto Steam. As revealed earlier this month, Legendary - or to give it its proper name, Skyrim v1.9 - not only adds a harder difficulty level to the game, it allows skills to be made 'Legendary', resetting them to 15 so they can be levelled up all over again. Why on Tamriel would you want to do this? Well, to increase your character level beyond Skyrim's 'soft' level cap of around 81. More details below.
As announced on Bethesda's blog, and elaborated over on Reddit, to reset a skill you first have to raise it to 100, at which point you can use the Book of Waking Dreams item to revert it to a puny 15. This adds a little dragon symbol under the skill name, but doesn't appear to grant any benefits to your character - other than "effectively the overall level cap", of course. You can reset the same skill over and over again, if you desire. (Thanks, Eurogamer.)
That's in addition to the new Legendary difficulty level, and quite a few bug fixes - my favourites being "companions will equip better weapons and armor if given to them", and "fixed rare instance of couriers who would appear only dressed in a hat". Here's the full, massive list:
General memory and stability improvements
Fixed issue with quest scripts that were not shutting down properly
Companions will equip better weapons and armor if given to them
Fixed rare issue where player is unable to learn the Clear Skies shout during "The Throat of the World"
Fixed rare instance where Alduin would become invincible during "Alduin's Bane"
Fixed a rare issue where player could become stuck in Night Mother's coffin during "Death Incarnate"
Fixed rare issue where protected companions could be killed from poison damage
Fixed rare issue with certain ash piles left from resurrected NPCs not clearing properly
Fixed rare issue with NPCs and creatures respawning improperly after player fast travels
Fixed rare crash when entering Dark Brotherhood Sanctuary
Fixed rare crash when entering a player owned home
Random dragon attacks will no longer occur during "Battle for Whiterun"
Fixed a rare crash when attempting to save your game during "Waking Nightmare"
Fixed issue where "Glory of the Undead" would not start properly if player is in combat with Eorlund Gray-Mane
The white phial is no longer consumed if given to a follower
If player marries Aela, the "Totem of Hircine" quest will be available
Unused briar hearts can be dropped after finishing "The White Phial"
Fixed issue with paying off a crime against the Companions that prevented player from getting Companions quests properly
Thieves Guild caches are now properly enabled in the appropriate cities
The Dragon Infusion perk now works properly when taking Esbern's Potion
Cragslane Cave properly resets if player receives a radiant quest to clear it out
Fixed rare issue with bounty quest objectives not properly clearing after completion
Gallus' Encoded Journal is no longer a quest item after completing the Thieves Guild
In "No Stone Unturned" Vex will now accept Unusual Gems if you've collected them all before starting the quest
Vekel the Man now gives rewards for completing "Toying with The Dead"
Fixed rare issue with being unable to turn in stolen items in "The Litany of Larceny"
Fixed issue with followers becoming over-encumbered after being repeatedly rehired
Fixed rare issue with visiting Kynesgrove on horseback not progressing "A Blade in the Dark" properly
Fixed issue with receiving a duplicate radiant quest from a Jarl
Fixed conflict with clearing Driftshade Sanctuary before starting "Trouble in Skyrim"
Fixed issue with using shouts while in jail and having guards unlock the jail cell
Fixed rare issue with quest NPCs not properly moving to quest locations
Fixed issue with NPCs not selling master level spells
Fixed rare issue where player gets control locked outside the Thalmor Embassy at the start of "Diplomatic Immunity"
Fixed rare issue with disappearing containers after upgrades in player owned house
Fixed issue with being erroneously attacked while as a werewolf during "Ill Met By Moonlight"
The Ebony Blade is now only improved by two handed perks
Locked door to Proudspire Manor can now be unlocked by proper key
Fixed issue with merchants not receiving the proper additional gold with the Investor perk
Fixed a rare issue where the player would be unable to learn a word after leaving for several days during "The Way of The Voice"
The Nord Hero Bow can now be improved
The Purity perk no longer requires the Experimenter perk
Fixed rare instance where Lovers Comfort would not be applied properly
If you approach Frostmere Crypt from the north, "The Pale Lady" will start properly
Fixed rare issue where player could be prevented from speaking with Atub to start "The Cursed Tribe"
Fixed rare issue where a dragon could appear in the Mind of a Madman realm and kill the player
Fixed instance where player could get stuck in Japhet's Folly
Fixed rare instances where Arngeir would not teach Worldwind Sprint
Fixed issue with "Ill Met By Moonlight" if Sinding dies before the quest starts
Gharol can now properly train up to level 75
Fixed conflict with visiting The Karthspire before starting "Alduin's Wall"
Reduced the instance of random dragon attacks after fast traveling post main quest
Recruited Blades now have appropriate dialogue while at Sky Haven Temple
Fixed rare issue where an incorrect dungeon could appear as a location during "Totems of Hircine"
Fixed rare instance in "Fetch me that Book" where books found before getting the quest would not be properly recognized
Fixed rare issue with traveling to Thalmor Embassy with companions during "Diplomatic Immunity"
Fixed issues with Matching Set perk not working properly with certain pieces of armor
Fixed issues with Custom Fit perk not working properly with certain pieces of armor
Fixed issue with NPC dying in a bear trap blocking progress in "Time of My Need"
Fixed rare issue with swinging door becoming stuck and blocking an entrance in Volunruud
Imperial Light Armor can now be crafted
Fixed issue with "Vald's Debt" where Vald was not leveled properly
Fixed issue with Vilkas not giving proper greeting after completing "Battle for Whiterun"
Fixed issue with respawning actors that were raised by using the Ritual Stone power
Fixed issue with the Ancient Knowledge perk not calculating properly
The Palace of Kings now has patrolling guards on upper floors
Reduce percentage chance of getting a werewolf loading screen while player is a werewolf
Pantea's flute is no longer a quest item after completing "Pantea's Flute"
Placing an unread Oghma Infinium on a bookshelf in the player's house no longer allows the book to be reused again
Adjusted dialogue priority to improve chances of hearing more combat dialogue from certain NPC enemies
Fixed issue with falling damage on high difficulty levels
Fixed bad collision on certain clutter objects
Fixed rare instance of couriers who would appear only dressed in a hat