Appears the new VDL version will be released on-line on 22-8-13 - thanks to this link from Marion51.
As you might have guessed it will have the proxy feature and optimisations from VPX5 but more detailed information could be available next week.
Has anyone else noticed a performance improvement since the latest MEP2013 patch?
On my system preview seems noticeably smoother with my AVCHD 1080 50p files at full res. Mercalli Pro stabiliser plugin calculates at nearly 3 times the frame rate ( this has been reported as an improvement by VPX5 users). RAM utilisation seems to have been improved showing frequent 200-300MB drops in Task Manager and overall lower usage on a 45min project with 330 plus AVCHD clips. Maybe some of the improvements are already in the last patch!