June 13, 2012"Weyland scientists discover the [b]inverse relationship between velocity and the flow of time[/b] making the long sought-after concept of faster than light travel a reality."
From my understanding of this and my hunch, I would say they are trying to explain that our current concept of FTL travel may be flawed.
In that, if I am not mistaken, the nearer to light speed an object travels, the more time dilates to this object. The world, observers, slow-moving objects around this object would experience time more quickly than the object moving at near light speed. In theory, if the crew of Prometheus were in transit to LV-223 for their perceived 2 years and 4 months, us observers back on earth should perceive many more years of their transit time, thus perceiving FTL travel to be possible to crew on board a ship moving very fast.
This trip may in fact have taken decades or so from Earth's viewpoint, but the crew may have actually experienced 2 years of time.
This would in theory allow space travel light distances if time dilation worked that drastically, and we could obviously design the propulsion to get us to close to light speed.
Oh and they mention the Prometheus having Ion Propulsion drives, and I have read that they may one day be capable of producing more efficient ion drives that may be capable of offering a low thrust/gradual climb in speed over the course of the trip but allow for attaining velocities (near light speed, maybe even 0.1-.25c would suffice) needed for reasonable travel time for crew
I think if you have a life supporting ship for voyage, propulsion capable of gradually but continuously accelerating to attain relativistic speeds and decelerating to slow down along trip, some form of stasis or cryo, and probably a million other advances in engineering/quatum physics/ biomed/ navigation, this would very well be possible