The latest issue of PC Zone magazine contains the first details from Bethesda's first Oblivion expansion, which will supposedly be titled "The Elder Scrolls IV: Oblivion - Shivering Isles."

Here's the scoop from ComputerAndVideoGames:

"...word is that the expansion will offer 30-plus hours of new adventuring, features new quests, monsters, expanded freeform gameplay - quest lines that branch more than before, for example - and a new land "that you can watch change according to your vital life-or-death decisions".

Setting the scene, it's explained that an ominous-looking gate has opened in Nibben Bay, the portal leading to a torn realm - the Shivering Isles - ruled by Sheogorath, the god of madness and dementia. Apparently, adventurers will meet the god and "plough through his trials", but it's additionally hinted that ultimately we may well be usurping the deity. A ETA of Q2 2007 has been given."