PLEASE NOTE: You should prefer "legacy" release series if possible. At the time of this writing, the most current release in the legacy-1.1 release series is https://github.com/mongodb/mongo-cxx-driver/releases/tag/legacy-1.1.0.
Please also note that the C++11 driver is now stable. Users of both the 26compat and legacy drivers are encouraged to migrate to the C++11 driver if at all possible.
See the MongoDB Server r2.6.11..r2.6.12 changelog for details on the changes in this release.