UK-based Firefly Studios is best known for their best selling Stronghold series of castle-themed RTS games. Now the developer has announced plans to move into the MMO space with their newly announced game Stronghold Kingdoms.

A teaser site for the game has already launched with Firefly saying that players will interact with thousands of others "in a persistent medieval world". Players can build villages and castle, attack other castles and/or defend their own from invasion and make their own medieval lord. Who knows . . . you might event become King!. The game is scheduled for a 2010 release date but so far Firefly has not indicated if this will be a downloadable MMO or a retail game release.