true, but there is E3 round the corner which they did bill as for the games, Activision will want all the COD lime light I would think, letting MS have all that for free by revealing the game proper is a big deal....
re the engine I would hope its scale able so lower end devices can use the tech, devs always throw everything at a tech demo to ensure it runs fluidly but I am sure its designed to run on mere mortals computers and thus on next gen hardware.
anyhow I hope to see some games in action, but here is where I got the "engine" preview and not the game preview.
Greenberg teases Xbox reveal, says E3 is 'all about the games' | Joystiq
"Greenberg then specifically called out Call of Duty: Ghosts, which will have its next-generation engine demoed during the Microsoft event."