I'm looking forward to the first first-person shooter built on Tango. E.g. a ghostbusters game in which you walk around in your own house, the ghosts only being visible through your Tango.
That would be absolutely incredible... Firefighters die every year because they get disoriented and lost in zero-visibility conditions. Even if it didn't have a pre-generated map of the structure loaded... it could build a map as it went, and at least be able to provide a 'retrace my steps' view.
It could also be networked with other devices, such that all of the routes mapped could be composited and help in the identification of alternative routes should one become blocked.
SIGHT: http://vimeo.com/46304267
Instead consider you won't see the actual items in the room. Polygon shapes will replace "real-space" items (coffee table, sofa, bed, doors) but can be dungeon items (for D&D) or items in an evil corporate waiting room (a la Mission Impossible or Metal Gear).
Personally I cannot wait to be chased by Cloverfield like monsters/creatures along the skyline and weaving in between buildings downtown. Movie ads are going to be amazing.