ISON is dead. What is being seen is the dust left over from the nucleus.
From NBC News:
"The comet may have fizzled, but scientists say sun-watching satellites are still seeing the dust left over from ISON swing around in a gravitational arc as it dissipates. "Dust continues to move around the orbit, just as it should," Pesnell told NBC News. The arc is visible in imagery from NASA's STEREO and SOHO satellites. "Yes, something came out from behind the occulter," Battams said in a Twitter update. "Pretty certain there's no nucleus, though." That accounts for at least some of the half-mile-deep pile of material that scientists thought the comet contained. http://www.nbcnews.com/science/comet-ison-vanishes-puff-mystery-it-goes-arou...
From Sky&Telescope:
"ISON's head — which swelled to brilliance just hours ago — seems in the latest spacecraft images to have faded right down to nothing at all. What's left is a long, thick streamer of a dust tail. The tail is destined to be flung widely across the sky as it comes out the other side of the Sun." A 2:10pm MST update states: *"4:10 p.m. EST:* The LASCO C2 coronagraph saw only the barest trace of material come out from behind its Sun-occulting disk after perihelion." Here's that 4:10pm EST image link. ISON remains are in the upper left of the Sun. http://soho.esac.esa.int/data/realtime/c2/1024/latest.html Phil Plait confirms there is material but nothing left of the nucleus/comet: http://www.slate.com/blogs/bad_astronomy.html The hope . . . . SpaceWeather.com that reports something emerged, either a fragment of the comet or the dust material discussed above. Time will tell but I don't think this will be the GREAT comet the media, S&T, Astronomy and others built this up to be. http://spaceweather.com/