I had heard the same news blurb, melted, but it appears to still be questioned.

http://www.nbcnews.com/science/comet...sun-2D11670914

"Right now it does appear that a least some small fraction of ISON has remained in one piece and is actively releasing material," he wrote. "We have no idea how big this nucleus is, if there is indeed one. If there is a nucleus, it is still too soon to tell how long it will survive. If it does survive for more than a few days, it is too soon to tell if the comet will be visible in the night sky. If it is visible in the night sky, it is too soon to say how bright it will be. ... I think you get the picture, yes?"