Xbox One to Feature Always Running Matchmaking
Larry Hyrb, aka Major Nelson, interviewed chief hardware architect Marc Whitten on his podcast. During the podcast, Whitten went into detail on how the Xbox One will always be running in the background, trying to find the best match for your skills, in the background. This will prevent the user from sitting for long periods in a lobby, waiting on a game to develop they can join. While a match is being found, if there is a delay, television or other media can be running on the XBox One and users will be notified of a match via a popup and can join right then and there.
More information on this technology provided by VentureBeat at the link above.