The Elder Scrolls IV: Oblivion - Shivering Isles Details

ComputerAndVideoGames.com has posted a few details about Bethesda's upcoming Shivering Isles expansion for The Elder Scrolls IV: Oblivion, based on what is revealed in the latest copy of PC Zone magazine.
...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".