A flashforward (also spelled flash-forward, and more formally known as prolepsis) is a scene that temporarily takes the narrative forward in time from the current point of the story in literature, film, television and other media.

"fast-forward" is the increase in the speed or the pace (the "2x", "4x", "8x" ) of showing the events afterwards. Unlike "flash-forward", you get to see all the events happening after 'the present' for 'fast-forward', only in a faster pace while "flash-forward" is a big jump afterwards, skipping all that in between.

It has a compelling concept and a solid cast. It's an intriguing, mind-bending concept that's mostly well executed, with a built-in payoff. ABC's new FlashForward requires concentration and endurance. It's well worth the investment of both.

noun. a device in the narrative of a motion picture, novel, etc., by which a future event or scene is inserted into the chronological structure of the work.