In June, the kernel team released MongoDB 2.1.2, which will evolve into the 2.2 release, as well as the 2.0.6 stable release.
At the same time the drivers team has been hard at work improving the drivers and adding support for new features in the upcoming 2.2 release. These releases are:
Additional improvements continue for MongoDB wrapper for Azure:
For up to date information on new MongoDB releases join the MongoDB Announcements mailing list.