I think "cinematic" means that the game plays more like a movie. For example, some systems allow for combat that plays out like a Hong Kong action flick. Action Points from d20 Modern and Eberron, used properly, can make it more "cinematic."
The BBEG is standing over the hero because the hero is down. BBEG is laughing, mocking our hero. The hero, normally, would be toast. But with a quick fake and final plunge, in other words the player used an Action Point, he miraculously dodges the BBEGs blow and hits a fatal blow of his own.
Things like that, IMHO, make an RPG more "cinematic" and less "I hit the bad guy with my longsword for 3 points of damage." A lot of people have been doing this in their own campaigns for a long time, it's just that the new systems that are coming out seem to foster it rather than hinder it.