ES4: Shivering Isles - Snippets @ CVG

CVG has a preview of the upcoming issue of PC Zone (one of the UK magazines in their stable), which offers some (very) brief details on Oblivion's Shivering Isles expansion.  According to the blurb, this addon will offer 30 hours of gameplay and branching quests:

Revealed in the latest edition of PC Zone magazine, 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".