Version 4.0 Milestone 2 for MyEclipse Enterprise Workbench for Windows, Linux, and Macintosh for Eclipse 3.1 is now available in the Downloads section. Please see the area titled 'Download MyEclipse for Eclipse 3.1'.
In this milestone we've added support for the Spring framework and WebLogic Server 9.0 as well as provided a large number of fixes and enhancements to all other new 4.0 features, as detailed in the milestone 1 "New & Noteworthy" document here:
We don't have a new and noteworthy for 4.0M2 because we did the port instead of making one. :-)
You'll need a fresh Eclipse 3.1 (RC3, RC4, or final) installation and JDK 1.4.2_05+ or JDK 1.5 on Windows or Mac, and *only* JDK 1.5 on Linux.