I've been following the K program, either picking up brochures from the manufacturers stand at Heli Expo conventions stateside or at Farnborough or at Helitech or talking to the reps. Its an interesting piece of kit. The avionics fit and commonality architecture of the cockpit be similar if not the same to the cockpit of the latest Bell AH-1Z Cobra Venon, UH-1Y Viper and of course the MV-22 Osprey (speaking of which will see it for secomd time running this RIAT and Farnborough).
One time, about a decade ago and if anyone remembers this - SABR - Support Amphibious Battlefield Rotorcraft program to replace Puma and Sea King Junglie, a list was drawn up from the MV-22 Osprey to the S-92 Helibus, NH-90, CH-47 and of course the CH-53. Like it or not the US kit is good, its good enough for the Corps nice firepower in the shape of AH-1Z (we damn near got that during the attack helicopter selection as it came neck and neck with the Longbow), good but limited firepower for the UH-1Y (and good command post), long range medium to heavy lift with the 53 Echo. I'm sure the CHF at Yeovilton wouldn't say no to generous proportion of lift
Though admittedly with the Tailored Air Group concept and JHC - one has firepower in the form of the WAH-64D and ship to shore projection with the Chinook Mk 2/2A, Mk 3