Hoping for a good show
I've been amused by all the comments I've seen around the web that are variations of "But won't the sun just burn it up?"
No it won't and for a few reasons. First ISON is big. I've heard estimates of between 1 km and 500 m. Second, it gets a bit of shielding from radiative heating by its coma. The coma is being pulled away by the solar wind, but it is still enough to slow the sun's heating. Third, while the sun's corona is very hot (hotter than its surface) it is also very thin. It's really a vacuum, just a slightly thicker vacuum than the vacuum that is out by Earth's orbit. Fourth, it's not going to be near the sun for very long. It's currently moving at 115 km/s and will be moving even faster on the 28th. It is currently 23 million km from the sun. It'll go past the sun by 750,000 km on the 28th. By the 30th it'll be 25 million km away from the sun (heading roughly towards us and north out of the ecliptic). In 4 days it will manage to cover almost 50 million km, which is roughly 1/3 of the distance from the Earth to the sun.
What might happen is either ISON comes through in one piece (admittedly smaller than it was) or tidal forces from the sun's gravity will cause it to break apart. If it does break up, it should have a larger tail than if it stayed in one piece. Comet Lovejoy (2011) for a quick comparison was only 500 m in diameter. At perihelion it was 5x closer to the sun and was moving at 500+ km/s. It survived intact and gave folks in the southern hemisphere a great show.