The USN CVNs will have 2 catapults on the bow and 2 on the angle, while CVF will have 1 in each position.
4 vs 2... (for "rails" read "catapults").
As for "risk"...
EMALS is nearly done... between May 25 and June 9 they conducted 14 launches with F/A-18E, and 12 launches each with C-2As and T-45Cs.
More launches are scheduled this month, and launches with an E-2C will begin shortly.
Production and delivery of EMALS components is proceeding for the Gerald R. Ford CVN-78.
http://www.pprune.org/6534939-post26.html
One suspects a bit of "it wasn't built in the UK so it couldn't possibly work" in that report.