They've been building the Fourth Ring Road on and off. According to its project, after they open the Forth Ring Road, the traffic jam situation on the MKAD and the Third Ring Road will improve.
The work began in 2008 with the construction of a parking lot which was to be above the road. Apparently, the builders were very enthusiastic about it at first, so the pace of construction was really fast.
In the end of 2009, they opened 4 auxiliary traffic lanes... and that's it.
If you google the road, this is what you'll get. The opening date keeps being put off. At first they said it was going to open in 2008, then 2009, 2010, 2011...
But as far as it looks, they won't be able to finish it in 2011 either.
Recently, new information concerning the road construction came up. So, according to Moscow officials, the project of the Fourth Ring Road is going to be changed, but by 2013, the road will be put into operation. Really?