This makes prospects VERY exciting
http://www.shopplaza.nl/astro/C2006P1.doc
Talks about the foward scattering, brightness may peak on Jan 14 UT at a whopping mag -5.2!
Also says
"In the forecast with forward scattering and n = 4, the comet’s brightness would exceed that of Venus over Jan. 13 and 14. The comet would be visible in daylight by binoculars and probably to the shielded naked eye in very clear skies. But if n = 3, the comet may be only marginally visible in daylight binoculars, if at all. If the comet can be located in daylight, visible/infrared photometry would be possible if the telescope and detectors can be shielded from direct sunlight. Between Jan. 12.3 UT and Jan. 15.7 UT, the comet will be at 8 deg or less elongation and visible in the SOHO C3 coronograph field at brightness levels likely to greatly saturate the central pixels unless precautions for shorter exposures are planned in advance."