StarCraft 2 Heart of Swarm will feature Groups System
StarCraft 2 Heart of Swarm will not only be getting clan support, but will also feature a groups system. Hit the link to see an explanation of the groups system from Battle.net
Blizzard has detailed the Groups are very similar to clans as far as features go, including, chat channels, news feed, and roster. The biggest difference between the two are Clans can only carry 20 members while Groups support a “nearly unlimited number”
In addition to that, Players can join multiple groups, while players can only join one clan. Check out Battle.net for more details.