Here are some of the more noteworthy things available the release of the June 28th, 2012.
It is possible to create an OMA-DM simulation that is stored in a file inside your workspace and can be edited using a Forms editor. Using this editor, you can easily:
Visualize (1), edit (2) the content of your Device Management tree, and configure (3) the way your tree content can be managed:
Simulate OMA-DM sessions.
The user guide of the OMA-DM Simulator is accessible directly from the Eclipse online help mechanism. Do no hesitate to contribute to the documentation effort by reviewing or completing the User Guide on the Eclipse wiki.