The newest pictures show that it looks like comet ISON consists of three bodies.
Above image: Original left | Darker right
Here is the link to the original image at: http://hla.stsci.edu/cgi-bin/display?image=hlsp_ison_hst_wfc3_130430_f606w_v1&autoscale=&title=Ison+130430+WFC3+F606W
Screenshot image link
Coincidence? A while ago during a revealing interview on TheLightOfDayRadioShow, remote viewer Ed Dames expressed his concerns about comet ISON and that this comet consists of multiple objects (The Ison group).
Related article: Comet ISON: Remote viewer Ed Dames gets nervous!