Harvey Gerst wrote a long time ago:
Let me make this perfectly clear: AFAIK, the mic is completely finished and working. During one of my last conversations with Stephen, he was still waiting on some unique parts to be finished so that they could begin production. These parts did not affect the final sound; they were strictly innovative switches. They did NOT affect the final sound in any way.
The mic is finished as far as I know and was expected to be shown either at the NAMM show in January, or released in February. There are no "final design decisions"; Stephen's vision was completed before he died.
Finally, Tony Merrill is far from just being "Stephen Paul's assistant" - he's become one amazing designer in his own right, who is more than capable of carrying on Stephen's legacy. He was in on the original design from the beginning - he fully understands the reason behind every piece inside the mic.
Stephen knew he was dying; from conversations with Stephen, it was pretty obvious to me that he meant for Tony to carry on his legacy, and he prepared Tony for that eventuality.
Is the mic still being brought to market?