Last week we posted some screens, background info and the pack shot of Cities XL 2011, but today we now have the official trailer. The video is a minute and a half overview of the game that states some of the important keys to designing a well balanced city and how to make it thrive. It might be best to follow the tips, or you could end up with a city such as Cleveland, and not the incredible lush landscapes and locales as seen in the trailer.