Dressage team looks quite fine. Rothenberger withdrew from Aachen due to slight infection that Cosmo got. He should be safe for Tryon, where he could as well take both team and individual golds. It's similar with Werth who withdrew Weihegold from Aachen and entered Emilio/Bella Rose instead (Bella Rose is finally back after 3.5 years!). Sprehe withdrew Desperados from both German championships last month and now Aachen, so I'd say she's probably out of it. But she may not be needed as Rothenberger, Werth, Langehanenberg + one of Schneider/von Bredow-Werndl should be big favorites.
As for eventing, I don't think Germany is the favorite at this point. Jung is having a poor season (already 2017 was quite poor for his standards). Klimke could be the best, though she had a refusal in Aachen. Krajewski has some good wins this season (Bramham, German championships, Aachen), but she is yet to do anything at the championships. Aside from those three, there isn't much depth in German eventing. I doubt Sandra Auffarth will be going, as these days it seems like she is mainly building a team of younger horses. Kai Ruder looked good in recent times, but not so much in Aachen. Hoy has decided not to chase team selection anymore at the start of 2018.