This has been called too early, comets are very unpredictable and ISON appears to be brightening again as it loops around: http://farm6.staticflickr.com/5480/11106507235_ec20b425d7_o.... (apparently the same thing happened with comet lovejoy).

Somewhat up to date information is being posted to this reddit thread: http://www.reddit.com/r/space/comments/1rn7fb/rspace_comet_i...