Shivering Isles comes out today or tomorrow.

Bethesda Softworks Announces The Elder Scrolls IV: Shivering Isles™ — Official Expansion for Oblivion
Spring Release Planned for Official Expansion for 2006 Game of the Year as Oblivion Sales Top Three Million Units
January 18, 2007 (Rockville, MD) — Bethesda Softworks, a ZeniMax Media company, today confirmed the upcoming release of The Elder Scrolls IV: Shivering Isles™, the official expansion for the award-winning The Elder Scrolls IV: Oblivion™. Shivering Isles will be released for Xbox 360™ video game and entertainment system from Microsoft and Windows this Spring. Details are presented in the exclusive cover story for Official Xbox Magazine’s (US) February issue, which hits newsstands this week.
Shivering Isles features more than 30 hours of new gameplay and allows you to explore an entirely new plane of Oblivion – the realm of Sheogorath, the Daedric Prince of Madness. Shivering Isles adds to the existing world of Oblivion so you can continue playing with your existing save game/character, or create an all new character just to explore the new content.
“We’re thrilled with the response that Oblivion has received to date and feel that Shivering Isles will offer a whole new and different experience to anyone who played and enjoyed Oblivion,” said Todd Howard, executive producer for The Elder Scrolls.
Within the Realm of Sheogorath, players can explore the two extreme sides of the god’s madness – the sublimely creative and the completely psychotic. Something is happening to the Shivering Isles and Sheogorath himself looks to you to be his champion and defend his realm and its inhabitants from destruction. Do you have the strength to survive his trials, tame a realm fraught with paranoia and despair, and wear the mantle of a God?
The Shivering Isles features a bizarre landscape split between the two sides – Mania and Dementia –filled with vast, twisting dungeons mirroring the roots of the trees they are buried within. You’ll encounter more than a dozen new creatures including hideous insects, Flesh Atronachs, skeletal Shambles, amphibious Grummites. Throughout your adventure, you will discover all new items, ingredients, spells, and more, and have the talented craftsmen of Crucible and Bliss forge new armor and weapons just for you.
“The enthusiastic response we’ve received to our downloadable content has been overwhelming, and we’re excited to bring Oblivion fans a full expansion,” said Vlatko Andonov, president of Bethesda Softworks. “The world we’ve created for Shivering Isles is unlike anything you’ve seen or played in Oblivion and we can’t wait for folks to play it.”
Released in March 2006 for Xbox 360™ videogame and entertainment system from Microsoft and Windows, Oblivion sold more than three million units in 2006. Among the countless awards and accolades it has garnered to date are Game of the Year and RPG of the Year honors from numerous outlets, including Spike TV’s 2006 Video Game Awards, G4’s G-phoria, the Golden Joystick Awards, GameSpot.com, ShackNews.com, Voodoo Extreme, FiringSquad.com, and many more. Oblivion received the #1 ranking on PC Gamer’s (UK) list of the top 100 games of all time and is the highest rated Xbox 360 game of all time according to Gamerankings.com.
The Windows version of Shivering Isles will be available at retail and is co-published by Bethesda Softworks and 2K Games, while the Xbox 360 version is currently planned for release through Xbox Live online entertainment network by Bethesda Softworks.

faq
When will Shivering Isles be available?
Shivering Isles will be released world-wide the week of March 26th. The price will be $30, or 2400 Microsoft points.
Is it just for PC, or for Xbox 360 too?
Shivering Isles will be available for both Windows and Xbox 360. The Windows version will only be available in stores. The Xbox 360 version will be available for download via Xbox Live. A retail version is not possible for the 360 at this time. Both versions will be released simultaneously, worldwide.
Will localized versions be available?
Yes, it will be localized into French, German, Italian, and Spanish.
Is this just another gate to Oblivion like the ones in the main quest?
No. Oblivion is made of lots of planes, one for each Daedric Prince. Oblivion featured the fiery realm of Mehrunes Dagon. The Shivering Isles is the realm of Sheogorath, the Daedric Prince of Madness. It’s a place unlike anything you’ve seen in Oblivion.
How big is Shivering Isles?
Shivering Isles is about the size Cyrodiil, where Oblivion takes place.
How many hours of gameplay should I expect?
About 30 hours of new content, including an all new main quest -- in addition to miscellaneous quests you can complete, lots of landscape to explore, dungeons to discover, etc.
Do I have to create a new character to play Shivering Isles?
Shivering Isles works with your existing save game/character from Oblivion, or you can start a new game of Oblivion and create a new character just for Shivering Isles.
Can I continue my quests in Oblivion once I start Shivering Isles?
You can go back and forth between Oblivion and Shivering Isles with your character whenever you like.
Will it be available for the PLAYSTATION3 system?
It is our intention to make it available for PLAYSTATION 3 this year, but no release date has been set.

source and more pics
new patch it breaks mods make sure your mod is updated most of the major ones have been fixed
linkhttp://www.elderscrolls.com/downloads/updates_patches.htma thread on what mods the new patch may have broken and what mods have been fixed.
http://www.bethsoft.com/bgsforums/index.php?showtopic=66173477 pics at this website check the ones that say neu
http://www.gamestar.de/aktuell/screenshots...ring_isles.htmlmake sure to check out the old thread