Wyvern Clan (future)
Sometime between 1997 and 2188, this clan will be founded in Wyvern, Scotland in an attempt to recolonize the site of one of the oldest known clans. Though it is possible that gargoyles from around the world will join this clan, gargoyles from the Manhattan Clan, the Labyrinth Clan, and the Avalon Clan would be most prevalent as these three clans all have their roots in the ancient Wyvern Clan. 
According to Greg Weisman, the Wyvern Clan will be more "back-to-basics," "attempting to return to the ancient ways of their race. Shunning technology for a simpler, better life." The Wyvern Clan will build some sort of structure to live in to replace Castle Wyvern. Their protectorate will be the lands around Wyvern Hill, just as the ancient clan protected it.
The new Wyvern Clan will be the twelfth clan to join the Gargoyle Nation, being founded before the Liberty Clan and after the Camelot Clan. Like the other eleven clans, their leader and their eggs will be kidnapped by the Space-Spawn in 2198 from Queen Florence Island.
As mentioned, gargoyles from many different clans may help form this clan, but the make-up of this clan will mostly be descended one way or another from the original Wyvern Clan. Therefore, the characteristics of that clan will probably be most evident.