In the newest Deus Ex trailer Eidos Montreal shows 25 minutes of gameplay.
The trailer contains both stealth and action passages to showcase the different ways one can play. The trailer begins with Adam Jensen arriving at the train station and meeting with an ally. The segragation due to augmentation is quite obvious and so it is not really surprising that opressed augmented react with a terrorist attack. After this scene the trailer shows footage of Jensen trying to find out who is responsible for the attack and so infiltrating a hostile area. The trailer demonstrates different ways of handling this situation. For example the EMP ammunition can deactivate cameras and the new Tesla weapon can stun up to 4 enemies.
The trailer also contains story relevant information so before watching here is a SPOILER ALERT!