User blog comment:Takagi-San/Highschool of the Dead Season 2 thoughts./@comment-5114030-20120604223517/@comment-3003168-20120605215010

The answers to those questions, if they are ever given, will likely be revealed in the manga long before the anime. Since we can't even be sure there will be a second season, you should probably just rely on the manga when the hiatus ends.