Nice update!
UL71M4 G33K, what about the A-10 (Warthog) and V22 (Osprey)? Despite high speed combat, turboprops will probably remain fairly useful on the battlefield for the forseeable future.
Ninjatheory brings up a good point that the fans could just be for maneuvering (like some sort of gravity-nullifying field generator) *edit - after looking closer, there appears to be some sort of acceleration device facing rearward from the top of the fuselage near the canopy, which would indicate the turbofans would work in conjunction with the main engine for stability and maneuvering*
The wakes underneath the Sparrowhawks look more like propwash. My best guess is that it's some sort of computer-assisted and accellerated hyper-propellor that gives Sparrowhawks good power and maneverability at low altitude, while the experimental engine provides more traditional thrust.
Navy Ordnance brings up a good point, with orbital insert and extraction, how do these things get into and out of different atmospheres? Can they achieve orbit under their own power, a la Pelicans?