Will it have a refuelling probe? The Sentry AEW.1 design would be pretty close, would it not?
The Sentry has both the probe and the US Boom-Receptacle system for AAR. The US system was only retained because it cost money to remove it from the design - however, this system is faster and more reliable for big aircraft tanking - in addition, there are usually more USAF tankers airborne during coalition ops. The probe gives some flexibility, but the flt deck crews prefer taking fuel from the boom. Also note that pilots need to qualify and stay current on both systems.