Firstly, GROB went bust
But long before then, I had some emails with their marketing head and they priced it at 1.4M euros which is probably about the cost of a brand new Jetprop, etc.
In Jan 2006, the man said "The project has not been abandoned but put on priority 2 as we are fully booked with our Jet program."
and that was that...
At some air show I spoke to them about the silly price and they said it was designed to be a military trainer so built to a high standard.