The Naval Service has specified a flight deck on the new OPVs, "for UAV ops only, deploying current naval UAVs with redundancy for medium size VTOL tactical UAV." What kind of UAVs are we likely to see on the new OPVs?

MQ-8B Fire Scout? Endurance of over four hours at 110 nautical miles from the launch site. Payload that includes electro-optical/infrared sensors and a laser rangefinder /designator.

The US Coast Guard's Eagle Eye?

Interesting RUSI article on naval UAVs: