Since MDM SP6 Patch1 was recently released for all customers, i thought it would be a good idea to point you to some resources that describe the new features that were introduced in the MDM Java API.
The first one is a Know How Network Call (KHNC) that was given back in December. The presentation and the recording can be found here.
The second one is the Data Unification How-to Guides for SAP NetWeaver 7.0 how to guide. It contains code samples to perform all kinds of tasks in MDM e.g. search, insert, update, delete, check-out/check-in, etc... and it uses some of the new features that were introduced in SP06 Patch1 so you'll be able to run these code samples and see for yourself how it works!