The games "exclusives" to MS were showed at MS press conference... the others on stage we already knows they are multiplat.
So by nature of that simple statement then it sounds like he was talking about games in general. If he were talking only about MS games then he would be more specific. Also, there is a great chance he has absolutly no clue what deals MS has made with other 3rd party exclusives. We can all guess all we want but in the end no one knows what deals are in place and for how long. If it's 2 years plus renewal or MS has exclusive rights to that version of the game. In the end it will be long enough to not make a difference.