PlayDevil recently tried out Dishonored:
Here is a snippet:
"Heading up development at Arkane Games is Harvey Smith, one of the minds behind such games as Thief and Deus Ex. It a heritage that shows as the gameplay begins to unfurl and the protagonist, a magical assassin, begins to make his way through the world. With a range of upgradable RPG-like skills the assassin will be able to use technology, magic, stealth and traditional weapons to help find any of the many routes through the world."