A few months back I posted a message about this dish and was told by another Chi Chowhound that the Berghoff had, in the past, refused to serve the dish due to the semi-raw egg involved. It appears that they have seen the error of their ways!
The Berghoff's current list of Dinner Specials includes Wiener Schnitzel ala Holstein (however, their website is still listing November specials).
I am probably going there tomorrow for my mother-in-law's birthday. If it is available, I will give it a try!