Frischknecht. Sounds German.
Anyway, I haven't. I have 'tweeted' Tom Pelissero, but I can imagine he doesn't have time to answer to every random fan. The guys that I'm following on twitter (Greg Bedard, Tom Pelissero and Rob Demovsky) haven't made any updates on him. Haven't seen anything on Packers sites either.
So far, all that is out there is that it is, like you said a 'serious shin injury' and that he has been brought to the hospital.