With the exception of Marathon, Race Walking, Heptathlon, Decathlon and the relays, German athletes need to fulfill the national standards between spring and summer 2016. So these athletes have fulfilled the national standards so far:
Marathon: Anna Hahner, Lisa Hahner, Arne Gabius, Philip Pflieger, Julian Flügel
Race Walking: Carl Dohmann, Hagen Pohle
Multi Events: Jennifer Oeser, Claudia Rath, Rico Freimuth, Kai Kazmirek (and Michael Schrader, but he's out due to injury)
Relays: 4x100m Relay men, and the 4x100m Relay women is basically qualified as well, as their time will be enough for the top 8 fastest.