I think the worst possible result for you would be 2 Gold (mens and womens hammer throw) and 1 silver (mens discus). You also have a good Chance for a medal in mens 800m and womens high jump and smaller medal chances in mens 50km race Walking, mens 400m hurdles, mens pole vault, mens shot put, mens discus throw (Urbanek), mens hammer throw (Nowicki), womens 800m and womens 1500m. My prediction would be that you win 2 golds (mens hammer throw, womens hammer throw) and 4 more medals (mens discus throw, mens 800m, womens high jump and a second medal in mens discus/hammer throw).
We were missing the following athletes:
Holzdeppe (mens pole vault)
Abele, Kazmirek (mens decathlon)
Harting (mens discus throw)
Klosterhalfen (womens 1500m)
Moguenara (womens Long jump)
Obergföll (womens javelin throw) (She wasnt nominated, but will probably be in Rio instead of Molitor, the current world Champion)
Lückenkemper didnt run womens 100m individually
Schäfer (womens heptathlon)
All of them, maybe except for Klosterhalfen, couldve won a medal (at least if fit) and i think we will see all of them in Rio.
Edit: I forgot Weber (mens javelin throw), he wasnt nominated but threw 88.04m today and should be in Rio together with Vetter and Röhler. German javelin throwers are now 1st (Röhler), 2nd (Vetter) and 4th (Weber) in world ranking.