We released the last maintenance version of the 2.0.x branch Doctrine 2.0.7 today. It contains a bunch of fixes backported from the 2.1.x and master branches. You can find the list of fixes in the Changelog:
This release marks the end of line of the 2.0.x branch. We will not port bugs for this branch anymore only security issues will get applied. Please upgrade to 2.1.1 when it will be released later this week. The upgrade to 2.1 is painless and the small number of backwards incompatible changes is documented. Also most of the BC related bugs in the 2.1.0 release will be fixed in 2.1.1.