Here are some pics I got from Robust Chen prior to his departure.
It was his intention to have all GO motors fitted with piston rings within a 6 month period.
These motors were to be available in ABC configuration, until such time as the piston ring versions became available, but then they would only be available in the ringed version from that point on as I understood it - so not much use to anyone not 100% sold on the ringed technology.

Now Mr Chen is gone, who knows what will be decided as regards the piston ring thing, as it was his big project.
Maybe they spent too much with no return for Mr Wang's liking, and he gave him the don't come Monday - who knows ?

The purple head is the Ce'ra (somewhat dearer then the normal GXII range).
The orange head is the GXII Plus + (about the same price as previous GXII model).

Pretty pictures anyway