This is a maintenance release. The following items were fixed and/or added:
VMM: fixed 64-bit guests on AMD Fusion CPUs (bug #8824)
VMM: fixed handling of the sysenter/sysexit machine instructions in 64-bit guests on Intel hosts
GUI: added linked clone support
GUI: fixed error check when changing the VM controller settings (4.1.0 regression; bug #9246)
GUI: fixed the inclusion of additional information (license, vendor, ...) on OVF export
GUI: when taking a snapshot from the VM selector, don't do a live snapshot
GUI: fixed immediate crash during start on certain environments due to a library version conflict
Guest control execution: implemented copying single files from guest to the host (directories and filters not supported yet)
Guest control execution: limited to serve up to 5 guest processes at a time by default
Main: return the correct RDP default port fixing settings warnings in the GUI if the remote display was enabled at runtime (bug #9368)
VBoxSVC: made the path comparison OS independent when images are registered (bug #9303)
VBoxSVC: several fixes/performance improvements for cloning of VMs
Snapshots: fixed "Solid-State drive" flag survival on snapshot creation (bug #9379)
VBoxManage: implemented copyfrom and stat guest control tools to copy files from guest to host and to check for existence of files on the guest
VBoxManage: fixed extpack install --replace (bug #9308)
VBoxManage: allow to start multiple VMs with startvm
VBoxManage: experimental support for SATA CD/DVD hotplugging
Mouse support: fixed an off-by-one pointer position error affecting Windows guests (bugs #7566, #9321)
VRDP: fixed a case when the screen was not redrawn correctly (bug #9242)
NAT: changed TCP connection establishment according to Winsock API requirements (Windows hosts only; bug #8919)
USB: fixed device recognition issues (bugs #9299) and fixed several device capturing issues (Windows hosts; bug #9299)
USB: fixed issues with remote filters being applied to local USB devices
OVA: fixed import of renamed OVA files (bug #9033)
Windows host: fixed icon for .VDI files (bug #9393)
Solaris hosts: fixed a bug preventing parallel usage of multiple host NICs with Crossbow based bridged networking
Linux hosts: fixed random kernel panics on host suspend / shutdown (4.1.0 regression; bug #9305)
Guest Additions: keep logged in user count in out-of-memory situations and warn about it
Solaris Additions: fixed shared folders due to missing symbols in the vboxfs module (4.0.12 / 4.1.0 regression; bug #9264)
Windows Additions: fixed file truncation on a shared folder with some applications (bugs #9276, #9315)
Windows Additions: fixed shared folder issues with antivirus software and 64 bit Windows guests (bug #9318)
Windows Vista and 7 guests: WDDM driver fixes and performance enhancements, fixed WinSAT crashes (#9267)
Linux Additions: fixed llseek() for Linux kernels 2.6.37 and above