Dubai World has sued MGM in an effort to protect their investments. MGM was recently late filing it's SEC documents saying it is questionable whether they can make payments on their nearly $15 billion debt.
Dubai World is the front company for the "group of investors" and own half of City Center by contract. This puts City Center on shaky ground.
Actually, this puts a variety of possible outcomes on several scenarios that these companies are involved in. It should be interesting.
This story has an amazing amount of factors that remind me of when Bugsy was building the Flamingo and kept getting more and more financial assistance until it finally killed him. MGM has been making similar pleas for more money for a long time.