Simtropolis reports the closure of Cities XL developer Monte Cristo (thanks Big Download). They explain that this should not impact Cities XL, as the authentication servers for the urban planning sim are still online, and an unnamed publisher will soon reveal they have taken over the project:

A publisher has shown up who will pick up Cities XL’s license, and who will continue to sell the game. This company will surely make itself known soon. We are confident that we leave Cities XL in good hands.

Current players shouldn’t be worried though! The solo game will keep on working and the online login system, mandatory to launch the game, remains in place. There is no change there. The Cities XL website also remains online, although obviously the online support is now longer available and we apologize for this.

One last time all the Monte Cristo team members would like to wholeheartedly thank the Cities XL players and community members who so dedicatedly took part in the life and evolution of this wonderful project.