Marvel 616 (that's the working title) is an anthology documentary show that ties Marvel's comic book universe and its creators to their historical and cultural contexts. Disney didn't provide an example, but Spider-Man's focus on a flawed, more nuanced character might be a good candidate. The other show, Earthkeepers (also a working title), is a documentary series centered around conservationists and the animals they strive to preserve.
Disney didn't say when either show would premiere, but teased that they'd be part of a "robust slate" of non-fiction service. We wouldn't count on either making the debut of Disney+ in late 2019 given the timing. Nonetheless, it's a good sign if you were worried that the internet service's originals would be limited to endless waves of superheroes, Pixar animation and Star Wars.