Recognized Historical German Community - German Citizenship Question?

My family has recently been researching to see if we are eligible for EU citizenship. While researching German citizenship, we found this on wikipedia:

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German nationality is acquired by descent under one of the following conditions:

1. Member of recognized historical German community abroad (e.g. in the Balkans, Kazakhstan)

2. Also granted to children/grandchildren of those deprived of citizenship by the Nuremberg Laws

Link (scroll down to Germany's citizenship by descent section):

http://en.wikipedia.org/wiki/Citizenship_of_the_Eu...

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I have not been able to find anything confirming or denying part 1, aside from my mother who believes that this is correct, although she cannot cite where she got that information. As such, I have two questions.

1. Could somebody please confirm or deny the part 1?

2. If part 1 is correct, could someone please link me to a list of these recognized historical German communities abroad?