Look Here:
http://www.acteurope.de/html/-s3d-system_2_4ghz-.html
You will need babble fish to translate but you can get the gist. It is the Nurnberg fair next week and I understand that they were aiming at launching the system there. Watch this space. I will certainly be getting one for my 4000. A mate got an XPS system for his MPX and it does not work well enough for him to trust it on a foamy glider! Nuff said.