Activision offers a new trailer from Call of Duty: Ghosts, showing off clan and Clan Wars support in their upcoming military shooter sequel. This is timely, since they are now accepting early registrations for clans in advance of the game's release. Details can be found in this One Of Swords blog post as well as this massive FAQ on the topic. Here's the summary:

Additionally, starting today through October 25th, Call of Duty fans can create and/or join a Call of Duty: Ghosts Clan prior to the game's launch in November. Existing Call of Duty Elite Clan Leaders will be able to reserve their current Call of Duty Elite Clan Name as their Call of Duty: Ghosts Clan Name on a first-come, first-serve basis, as well as copy over and manage their existing Call of Duty Elite Clan Member roster. New players and players who don't already have a Call of Duty Elite account can sign up for a free Call of Duty account to create their own Call of Duty: Ghosts Clan, or join an existing one.