Cosmos 2 wil not be launched on a Volna rocket
"We are comfortable with the conclusion that Cosmos 1 never made it to orbit because the launch vehicle failed. But we are not comfortable with the reason it happened: the Volna selected for our payload had not been upgraded to correct a known failure mode. We will not fly on a Volna again. We’ve learned that lesson—and it was certainly a hard one. We are now ready to find a new launch vehicle, establish better launch vehicle interfaces, and try again to fly the first solar sail spacecraft."
http://planetary.org/solarsail/update_20050930.html