We have found out what the free games are going to be for Xbox One owners for the month of June, as long as you have a gold Xbox Live membership.
They are as follows:
Assassin's Creed III
Dragon Age: Origins
Phantom Dust DLC
For Watch Dogs, Assassin's Creed III and Dragon Age: Origins, This could have something to do with the fact that all of these games have new installments coming out to add to them. Not to say that SpeedRunners and Phantom Dust are not significant games to be offered for free to Xbox users. but with the former three games being triple A titles, the game development companies could be trying to get gamers excited about their new triple A titles that should be coming to the market soon, and hopefully with more information coming about them once E3 arrives.