Pydev 1.6.4 is now available.
The major change is the new unittest support, which was previously commented at: http://pydev.blogspot.com/2010/12/improved-unittest-support-in-pydev.html
Now, there were some other changes since that post that are worth mentioning too:
The default Pydev test runner can now distribute tests among multiple processes, which can make testing much faster (if you have multiple CPUs available). Although note that if the tests weren't properly designed they may break. One example would be the case when 2 tests end up writing/reading to the same file.
Note that there's also an option to run all the tests from a given module in the same process (instead of separating them 'randomly' among processes).
See: http://pydev.org/manual_adv_pyunit.html for details on the flags to be passed to enable running in multiple processes and basic instructions on how to use the new unittest integration.
Also important is that a major bug was fixed -- in this bug, existing interpreters could end up being corrupted when a new interpreter was added (so, if you are using multiple interpreters you're strongly advised to upgrade) -- note: if there seems to be some issue with corruption of the internal pydev indexes, ctrl+2 --reindex can be used (while in the pydev editor) to ask for the pydev indexes to be rebuilt (which would be the case if the globals browser is not working properly or the pydev code analysis was manually stopped for some reason) it shouldn't be needed, but, if the need arises, it's there :)