Announced at gamescom
Dedicated servers for Xbox One players of Call of Duty: Ghosts will be possible with Xbox Live Cloud. This was announced this morning by Infinity Ward's Mark Rubin at a pre-gamescom Microsoft Xbox One press event.
In related news, new multiplayer mode for Call of Duty Ghosts, called Blitz, is an objective based game that has players thinking tactically to control two points on a map. Players using the best strategy for offense and defense will be rewarded. This will be shown off at the Xbox booth at gamescom.