The latest news of the comet ISON is that it appears to have survived the passing by the sun. Just barley, since there is not a lot left to see now according to latest images shown on Spaceweather.com website. It is not currently known what did happen to the comet, but it appears as it was mostly vaporised by the sun. Comet ISON was just one of many sungrazing comet that have not survived this interaction with the sun.
How much of the comet remains it difficult to know at present time, but I am sure that more details are going to appear in next few hours to days on what did happen to comet ISON.