There were demonstrations of new cool AR stuff, like the Head Mounted Displays (HMD) of Vuzix and Sony, car exterior and interior tracking, an augmented city and the Lego-in-store AR concept.
There were many tracking and mapping methods demonstrated, for example the pointcloud method (SLAM). This method doesn’t need a marker or gps to track an object but instead builds up a 3D model of the space around it, and then places a virtual 3D object on the scanned surfaces.
Also very cool (and very expensive!) is the tracking method that Metaio used to track a car exterior with infrared cameras placed above and around the car. The cameras track the car very precise which makes the augmentation very realistic and fit exactly on the car. Cars are some of the most difficult objects to track because of the shapes and reflections.