There are, we’re told eight or nine different broad methods of completing a level. These were but two, and both were fatal. Another would have been to look for side missions in the streets around the Golden Cat – which, despite being a multi-tier building filled with side rooms and cellars and surrounded by gardens, constitutes “less than half” of the level’s overall space. One side mission opens up the roof path that allowed a stealthier entrance to the cat, but another would have involved doing favours for a local gangster and thus persuading him to help Corvo’s cause. It’s not shown today, but done right this results in the gangster kidnapping the Pendletons and forcing them to work in their own slave mines.

Yup, there's a ton of previews today. I posted a bunch here http://www.bethblog.com/2012/04/26/dishonored-preview-blowout/