I just saw it today in Turf magazine. It's an attachment for the Kombi system. I looked up some youtube videos but apparently it's too new as of yet. I did see and echo bed definer and a home-made job that worked really well even creating new edges.
I called my dealer today and they just got some in. If anyone has/gets experience with one of these, let me know. I'm extremely interested in one. The go for $250. I went to the Stihl website but couldn't find any info on them.