Blizzard Entertainment has updated Overwatch on the Xbox One to add Competitive Play (available after reaching level 25), remove the “Avoid This Player” feature and balance heroes McCree and Widowmaker.
As for other changes, another important one is the improvement of dead zone controls providing “increased accuracy during off-center and diagonal stick movement.” Players can also adjust the strength of aim assist if they so desire.
Other changes include bug fixes and the like which you can read more about here.
Source: Rheena.com