This is a maintenance release. The following items were fixed and/or added:
GUI: Mac OS X host: introduced extradata option "GUI/HidLedsSync" aimed to enable HID LEDs synchronization (feature disabled by default)
GUI: Mac OS X host: fixed issue on MacBook Air/Pro hosts when GUI might freeze in attempt to synchronize HID LEDs
Main: always expose the DMI memory information to Windows 2012 guests (bug #12017)
HGCM: fixed crashes under certain conditions
Storage: fix for BLKCACHE_IOERR runtime errors under rare circumstances (bug #11030)
AHCI: fixed a bug which resulted in Windows XP guest hangs if a SATA CDROM is attached (bug #12417)
AHCI: fixed a Guru Meditation under certain conditions
E1000: if the cable was disconnected before the guest initialized the device, the link status was not properly set to 'down' after the initialization completed despite the fact that there was no connection
3D support: fixed offset of guest 3D image elements (Mac OS X Retina hosts only; bug #11021)
3D support: many fixes
Linux Additions: support Enterprise Linux 6.5 kernels (bug #12505)
Linux Additions: fixed CPU hot-remove on newer Linux kernels
Windows Additions: fixed guest crashes in in Shared Folders service under certain conditions