Sources are telling the Las Vegas Sun that City Center may be forced to file Chapter 11 bankruptcy tomorrow, if they miss an important financial payment.
This is also being covered by the WSJ: http://online.wsj.com/article/SB123811086468552891.html#mod=testMod
NOTE: This isn't a filing for MGM Mirage, just City Center LLC.
We'll see what happens here. It is unclear if MGM Mirage would be allowed to make the Dubai World part of the payment if they wanted to and if they did, it might not be in their interest to do so, even if they had the cash.
At this point, both companies are positioning themselves in a legal pissing contest for control of the project.