This bit is the only news I found on this.
"The Gunboat 55, designed by Nigel Irens, is the first boat to come out of Gunboat’s new production yard in North Carolina
. Production of the Gunboat 60, formerly built in China
, is also being moved here."
2014 NEWPORT INTERNATIONAL BOAT SHOW: Gunboat 55, Varianta 37, Salona 33, C&C Redline 41 | Sailfeed
There's nothing on the GB site or anywhere else. I read an earlier story about how GB founder and owner Peter Johnstone was up quite a bit at night trying to keep things going in both plants which are a half a day apart time zonewise. I wonder if it just got to be too much? The Chinese GBs were subcontracted out to an established boat builder
there I believe. And/or built under license
The new GB4 is being built in Denmark