Latest beta versions are now in public release for those with existing licences -
http://pldaniels.com/flexbvA good number of improvements over the existing stable,including the following;
* Butterfly view mode (can be turned off too)
* Faster rendering, maintain 60fps easily without chewing your CPU to death
* PDF search system greatly improved, with in-page or per-page stepping forwards/backwards.
* User-customisable keyboard actions
* PCB themes (easy to create your own too)
* Fabmaster, GenCAD and HyperLynx file formats now readable, great for people with Eagle/KiCAD/Altium/OrCAD