Activision released their Call of Duty game companion app Call of Duty Elite for Windows Phone 8 devices. Similar to Halo Waypoint app, CoD Elite app lets you track mulitplayer progress, leaderboards, etc,. This app got updated to v1.1 with many new features.
v1.1.0:
Custom Classes – edit your custom classes and push them to Call of Duty®: Black Ops II and Call of Duty®: Modern Warfare 3.ap
Challenges – view your in-game challenge progress for Call of Duty®: Black Ops II and Call of Duty®: Modern Warfare 3.
Search – search and view other player’s and clan’s stats.
Push Notifications – get the latest Call of Duty® news and updates directly on your device.
Download it here from Windows Phone Store for free.