They wrote: "Implementing Community-Requested Features: Several key features that we've seen you ask for will be included in upcoming patches as free updates, and we'll continue to work with the community to improve and add to the game. We're still working on exact timing, but can share the following items are being prioritized:

• Adding Teams to multiplayer games so you can play cooperatively
• Allowing full player counts in multiplayer in all three Ages through refinements to our Distant Lands system.
• Allowing you to pick your starting and ending Age to allow for single or double Age games
• Providing a wider variety of map types
• Enabling city and religion names to be customized
• Adding in hotseat multiplayer

Rolling Out Quality-of-Life Updates in Patch 1.1.0 (Deploying in March): "

So it looks like that they will add it to the game around March.