Nothing news under the sun. *My Phönix, the last one build out of 8, already
had a cockpitvent-system on the top of the fuselage behind the canopy, which
can be opened and closed in flight.
I have been trying to enclose a photo but I was unable to upload a photo.

The Phoinix was ahead of it's time in even more regards than I
thought! The idea of venting cockpits isn't new, but it seems to have
been lost and rediscovered a few times since then. With each new
iteration though, different solutions to differing aspects of it have
continued to evolve, just like with wings. Wil Shuman brought it back
up in the 70s too but design continued on with predominantly
ineffective ventilation, being largely ignored (there are
exceptions...) by manufacturers until DG's 2008 release of the Mandl
(also right before the worlds...)

Butler was already using his vent in comps by that point, which
Bosman's is rooted in.The JS-1 vent is an entirely new take on an old
problem though, representing a clear departure from previous solutions
and was carefully designed using modern knowledge and computational
tools.

So far, the "WGC Six" seem to be doing well in a field of 51
http://www.flatlandcup.hu/2010/class_18m.php ships FWIW, taking 1st
place 2/3 practice days + decent overall placings, but it was already
a fabulous glider before the vent...

-Paul

PS. Hans, please PM me the photos of your Phonix vent!