Yep. When Dragongarde was announced after Zeal, the OS group, Spire (RoT) group and the two independent towns of Skyforge and Camelot began planning an Empire. We never got far enough to give it a proper name, but I believe the tempoary name was "The Dragon Empire". It was going to consist of Xandria Dominion (Newerth, Nevermore), Kingdom of Obscurity (Panorama) and Kingdom of Edolas (Lightforge, Canterlot).
There was a huge alliance going, but we never really got to work with an Empire since there was simply too many different groups with different opinions. The idea ebbed out as each kingdom got busy with internal affairs.