Clarification from the horse's mouth (Airbus Defence and Space press release dated 20 nov 2014.)
In French service the A330 MRTT will be powered by Rolls-Royce Trent 700 engines, be equipped with a combination of the Airbus Refuelling Boom System and underwing hose-and-drogue refuelling pods, and can be configured in a variety of layouts carrying up to 271 passengers as well as medevac arrangements including the French MORPHEE intensive care module carrying up to ten patients as well as 88 passengers.
Also, the French Minister of Defence announced that it would be called the “Airbus A330 Phoenix".