After plunging through the solar atmosphere, ISON emerged as a headless ghost. Its nucleus dwindled away to nothing and most of the tail simply evaporated. Astronomers assumed that the comet completely disintegrated and died a fiery death.
However, several hours after perihelion, ISON began to brighten up again. Everyone watched in disbelief at how quickly the comet developed a wedge-shaped coma and a dust tail. Unfortunately, the renewed and rather substantial coma failed to evolve. At the moment of writing this (early morning, December 1), Comet ISON is fading at the rate expected of a simple, inactive debris cloud moving farther from the Sun's illumination.
It now seems unlikely that there will be much to see when the comet (or what is left of it) returns to dawn visibility after December 5. Keep in mind, however, that during most of the last month, Comet ISON brightened and dimmed in unexpected ways. There may be hope yet.