A: The new Call of Duty® app is planned to support PC players once it launches alongside Call of Duty®: Ghosts for current-gen consoles and Windows PC on November 5, 2013. Once the Call of Duty® app launches, PC players will be able to log in to their Call of Duty® account using their mobile/tablet device or via the web site, and add their PC/Steam account info, allowing them to start or join a Call of Duty®: Ghosts Clan.
However, because we've introduced cross-platform Clans for Call of Duty®: Ghosts, there is a workaround. For PC players that also have either a Xbox Live Gamertag, or a PSN ID, they can simply sign-up for a free Call of Duty® account now at
https://profile.callofduty.com/cod/register, add either their Xbox Live Gamertag or PSN ID to their Call of Duty® account, and then start or join a new Call of Duty®: Ghosts Clan today. Then, once the Call of Duty® app launches on November 5, 2013, PC players can log back in to their Call of Duty® account, and then add their PC/Steam account info to their Call of Duty® account, and they'll be all set to enjoy Clans on Windows PC.