This is the UXV Combatant, is a new unmanned combat ship being developed by BAE Systems. Yes, a drone.... The ship is also a hanger for fleets of unmanned drone vehicles. Does this remind you of Star Wars Episode I?
The battle ship is that it will use, "Full integrated electrical propulsion with twin propeller shafts/motors supplied by gas turbine and diesel alternators. Alternatively, cruising power can be supplied by two shafts/motors and diesel alternators with boost power from one gas turbine driving two water jets." (BAE) this means that it will cost low on fuel efficiency.