If you're a member of a clan, you may donate resources, communicate with clan members and join clan wars. Clans wars may not be included into the first release, but they will be added for sure!
Clan battles is real fun and I will tell you about strategies and upgrades in my next postings! :)

If you're a clan owner, you will be able to select how to upgrade your clan, accept or decline requests to join or kick out clan members. Also, you will appear in the hall of fame as a clan owner, if your clans has lots of strong players.

That's all for now, I will keep you posted about clans.