-- New and Noteworthy (5.0.0beta1) --

This beta release of the plugin includes the recent Checkstyle 5.0beta1 (read here).

The 5.0.0 version of the plugin will be a major restructuring of the existing code. This includes splitting the grown, rather monolithic plugin into multiple smaller plugins where future development will be much easier to handle (hopefully).
Most of the dissecting and putting-back-together has already taken place but is not yet finished.
However, on the surface most things will still be where you have come to know them.

After you install the plugin and restart Eclipse the plugin will automatically migrate your Checkstyle-enabled projects to the new plugin version. The .project file of those projects will be modified in this process to reflect changes in the plugins package structure.