The boost C++ libraries have been upgraded to 4.4. which includes numerous changes. For details, see the release notes:
Some key features include new libraries for UML2 FSMs, Polygons, Factory and Forward adapters, and a UUID library. Existing libraries have been updated with many new features as well as performance improvements.
The libjpeg library has been replaced by libjpeg-turbo library which has same API/ABI but is at least twice faster on all primary architectures and about 25% faster on secondary architectures