UPDATE #2: EA demonstrated a High Dragon battle in Dragon Age: Inquisition live on its conference stage. The purpose was to show choice; you can either steam in and fight in real-time, swapping between characters on the fly, or you can choose a top-down tactical view and issue orders that way. We didn't see this in action.
BioWare also introduced us to a few of the new characters in your party - your inquisition.
UPDATE: Microsoft has clarified that the exclusive content will be the first single-player add-on for Dragon Age: Inquisition. This will arrive first on Xbox (360 and One).
ORIGINAL STORY: Microsoft has signed some sort of content deal with BioWare for Dragon Age: Inquisition.
A new trailer aired at E3 for the game announced "premiere content first on Xbox". What that is, is unclear.
The new trailer showed a varied, colourful and raucous fantasy world to explore. The fire effect hurled from a dragon's chops was fantastic.
The game's out on new-gen and old-gen consoles, as well as PC, 10th October.