This story is at http://phys.org/print305488101.html … scientists are still unsure how much of the comet may have survived its encounter with the Sun – if anything but a lot of dust. mOst astronomers believe it was destroyed – 90 per cent is bandied around (but who believes such figure hugging). They think that small pieces of rubble could have survived, up to 1m across. However, it is still possible that larger pieces are still out there moving along the comet's trajectory but these have yet to be observed – and lots of telescopes are still pointed in the direction of ISON. NASA intends to monitor the comet as it is possible a new coma and tail will form if a substantial piece of it has survived.
See also http://phys.org/print305457867.html — where Karl Battams assures everyone the comet fell apart.