I've posted in Tour de Suisse thread that this is horrible news.
Update is saying that he's in medically induced coma.due to further analysis.
It would be very interesting to see report from hospital. Procedure in hospital, in order to give best possible treatment, probably requires all information about latest treatments, including those during the race and especially ones immediately before the accident. If team doctors wanted to hide something, doctors in hospital will find it anyway.
UCI has to get that report and see if some irregular medical practice is taking place in Katusha.
It doesn't have to be irregular exclusively from doping point of view, it could be unprofessional too.
This accident could have wider consequences than we can assume.
The sad thing is that Kirchen's career is over, probably not by his mistake.