We’ve released a new MPS build. The main change is transition to IntelliJ IDEA platform: framework for creating IDEs. As usual you can download it from here: http://www.jetbrains.net/confluence/display/MPS/JetBrainsMPSDownload+Page
P.S. There are no MPS plugin for IDEA which enables to work with Java and MPS from the same IDE but we have plans to create one.