ES4: Shivering Isles - Previews @ CVG, Gamehelper, Shacknews

A trio of new Shivering Isles previews is available on the 'net with articles from CVG, Gamehelper and Shacknews.  Here's a snip from the latter:

Though questing itself is handled essentially the same as it is in Oblivion, there are some new gameplay elements as well as some modified ones. For example, the prison system is handled in a different, and somewhat more brutal way. Upon being apprehended, your equipment is confiscated and you are placed in a dungeon--an actual, dungeon-crawling dungeon, not merely an underground  cell. To reacquire your belongings, you must fight your way out of the dungeon with little more than your fists. Failing to do so, you may simply wait out your sentence.