What do you mean by that light is subluminal? Literally it means that light travels slower than light, which is probably not the intended meaning.
Kloth answerd as I would.
By the way, electrons in water can be faster than photons in water. No big surprise maybe, if this hapens with neutrinos and photons in a (near) vacuum.
http://www.nature.com/news/2011/110922/full/news.2011.554.html
http://arxiv.org/abs/1109.4897v1
http://usersguidetotheuniverse.com/?p=2169
http://news.ycombinator.com/item?id=3027056
Perhaps the end of the era of the light cone and beginning of the era of the neutrino cone? I'd be curious to see your probability estimates for whether this theory pans out. Or other crackpot hypotheses to explain the results.