* Support for Dual Fullscreen Outputs for supported graphics cards.
These can be independently configured in many different combinations including MultiView/Program,
Preview/Program, Program/Input etc.

* Completely new audio engine with support for input monitoring on headphones ("Solo" button), Compression and Gain on the main output
and separate configurable audio outputs for headphones and main mix.

* Improved Virtual Sets (UV Map support for talent reflections and accurate video screen mapping)

* MultiCorder support for recording independent audio channels instead of main mix.

* Change inputs on the fly while preserving all settings.

* Missing capture inputs in presets will show up as offline inputs and can be reset when the device becomes available or changed
to a completely different input type.

* Title Editor supports changing images

* Many other minor features and fixes

Please post any comments or questions regarding these new features below.
All new feature requests should go into the Feature Requests forum as per normal.

The first vMix 13 Preview is expected to be available for download sometime in June.

Regards,

Martin
vMix
Source: http://forums.vmix.com.au/default.aspx?g=posts&m=9673