Some of the great improvement here include Vista support for Disaster Recovery, hardware migration and Windows 7 migration from Windows Vista.
Added other than bitdefender encryption, now Sophos 5.5 endpoint encryption is also supported.
To add further, a web console for help desk to do troubleshooting is now found instead of relying on MMC.
Though this release did not have any support for Windows 8 which means support for USMT version 5 is yet to be included. I hope to see more improvements such as these above soon.
I will do an article on Mirage 4.2 soon.
See the release note here.
Documentation can be located here.
Download the binary here.