As read on a other forum i found this drawing of a class of 5 ,optional a 6th Patrol Boats for the USN to replace the Cylcone class a total of 48 is planned. As far as this moment only a small amount of info is released:
Boats will be build by SAFE boats international llc, first Mark VI will be delivered to the USN in 2014
''Mark VI Patrol Boat''
Lenght: 85 feet (25,91 m)
Propulsion: 2 diesel engines and waterjets
Fuel: JP-5 and marine grade diesel
Range: +/- 600 Nautical Miles (1111,2 km)
Speed 35 to 41 knots (64,82 to 75,93 km/h)
Weapons: 1 MK38 25 mm autocanon*
''The Mark VI will have berthing and galley facilities to allow for extended missions, and shock mitigating seats will be fitted at crew work stations. The main cabin is reconfigurable to accommodate remotely operated vehicles, a medical triage area, or provide more shock-mitigated seating.''
* Shown in Artist Impression : 2 MK38 25 mm autocannons and 2 to 4 .50 Cal Machine guns