But, with nothing designed in to produce steam for the models of catapult currently in production, so those can't really be fitted. The RN will have to wait for EMALS.
There is spare electrical generation capacity, and room, for the power-generation sets for EMALS, but that won't be ready for production until ~2014... The first components of the EMALS equipment are scheduled to be delivered in 2011 for installation in the USS Gerald R. Ford (CVN 78), which is scheduled to be delivered to the US Navy in 2015. CVN-78 will be the first ship fitted with EMALS.