The latest release, Scala IDE 4.0.0, has been re-build on and re-packaged with the latest Scala releases: 2.11.6 and 2.10.5.
It contains the improvements provided by the new version of Scala. For more details, check the Scala release notes: 2.10.5 [1] & 2.11.6 [2].
As usual, this build is available as an all-in-one bundle [3] and through the update sites [4], for new installations.
Existing installations can be updated using the Help -> Check For Updates feature.
Enjoy,
Luc Bourlier