The original NSF thread on launch here : http://forum.nasaspaceflight.com/index.php?topic=20881.90
Thorough report on all experiments:http://www.weblab.dlr.de/rbrt/pdf/AAS_12072.pdf
"THE PRISMA FORMATION FLYING DEMONSTRATOR: OVERVIEW AND CONCLUSIONS FROM THE NOMINAL MISSION"
PRISMA has demonstrated a large variety of aspects of formation flying and rendezvous. The GNC ex- periments include several sets of experiments involving closed loop orbit control using the GPS, VBS, and FFRF on-board sensor systems. Results and conclusions from each of the participating organizations OHB- SE, DLR, and CNES have been presented in the respective sections. After conclusion of the nominal mis- sion, an extended mission phase has been initiated in which the original PRISMA partners as well as other organizations have been invited to implement new experiments for execution on the PRISMA platform. So far, experiments by Space-SI, Slovenia, GMV/ESA have been executed. An additional experimental phase by CNES was also implemented and executed as described above. As explained above, also DLR plans for an additional experimental campaign. At the time of writing this paper, PRISMA still has a significant amount of remaining delta-V and the authors encourage other organizations to suggest implementation of relevant experiments on the platform.
The sats are still in orbit, not much news coming in last few months though, last post here was from September 2011http://www.prismasatellites.se/latest-news.aspx