In Germany, you can currently get RF controlled dimmers/switches that can be used as a replacement for the standard flush switch installations found in most homes in DE.
http://www.elv.de/rev-icomfort-helligkeitsregler.html (There’s a manual in de/en linked on that page)
I couldn’t find anything about OpenHAB and iComfort, REV or Ritter so far. Does anyone know if that’s just a fancy label for an existing standard that is compatible with OpenHAB, or if it’s actually a custom thing for which we’d need a separate binding?
There also is a LAN gateway.