The first of the new Magneto-Plasma engines has been designed, and when the opportunity affords, we can re-engine our Carriers and Battle Management Vessels.
The new engines offer a boost to both speed and operating range:
5120 kps instead of 3840 kps.
70.5 billion km instead of 51.5 billion km.
Naturally our Carriers won't actually have quite that high an operating range, since some of the fuel is for the Fighters rather than for the mother-ship.
Unfortunately, while you can upgrade the engine of every other vessel, there is no in-game mechanic for re-engining a Fighter. I'm thinking of just building a couple hundred new-model Fighters (with an uprated engine) to represent the amount of time, effort and expense required, then using command mode to swap the engines manually.
The point is that my best and newest Fighters would naturally be given to my most experienced crews, not to untrained noobs... and the above method is the only way to actually do that in-game.