Monte Cristo just announced that four new planets have been added to the Cities XL galaxy: [US] Titan, [UK] Metis, [FR] Albiorix, and [DE] Belinda. This was done "in order to allow for an ever growing number of cities to be built."

Planets in Cities XL are persistent worlds that can be accessed through the multiplayer Planet Offer subscription service. Players can build up to five different cities on these planets, as well as trade and collaborate with thousands of players.