The first day features a special episode of Inside Xbox, which is where any new games (and perhaps even the Xbox 2) would be revealed.
Source: Xbox One and Xbox 2 games NEWS: Studio kills two huge new game rumours

The first day features a special episode of Inside Xbox, which is where any new games (and perhaps even the Xbox 2) would be revealed.
Source: Xbox One and Xbox 2 games NEWS: Studio kills two huge new game rumours