Size: 5.4 GB
Microsoft Hyper-V drivers have been added to allow CentOS to be more efficient as a Virtual Machine when installed on Microsoft Hyper-V server.
The samba4 libraries (provided by the samba4-libs package) have been upgraded to the latest upstream version to improve interoperability with Active Directory (AD) domains. If you upgrade from CentOS-6.3 to CentOS-6.4 and you have Samba in use, make sure to uninstall the samba4 package to avoid conflicts during the upgrade. samba4 is still - at least in part - considered a technology preview.
As announced in the CentOS-6.3 Release Notes matahari is now deprecated. CentOS-6.4 ships one last update that should remove all remains of matahari. To ensure all remains are erased run yum erase matahari* after updating to 6.4.
dev86, iasl, and qemu-guest-agent have been added to the i386 architecture.
For more read here: http://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.4