Nope, Morphicon will sell the german version. The german version will have english voices as was confirmed by Morphicon.
The game itself, editor, sp campaign, briefings, intro scenes/videos etc etc are all in german.
Changing/editing the stringtable will alow people to change it to English, not all offcourse but at least the editor and other stuff.
I think redoing the complete SP campaign will be way to much work.
Also have a look at this topic
ADDON, sry, forgot to answer through what medium.
The german version can be bought at amazon.de. The problem with amazone though is that it will only deliver at certain countries (dont have the list at hans atm, if you want let me know and I get it for you). So the best solution for now for people who are in countries not "supported" by amazon.de is to try and find someone they trust and who lives in a country to where they deliver to make a deal with him to ship it through others around the globe aswell............yeah, that sucks :(