Someone who studied the teaser found an image of a character called Rage in the montage of comic-book panels under the Marvel logo at the beginning, leading to the suggestion that that's the character Richards is playing, rather than Luke Cage. I guess it remains to be seen.
Agents of SHIELD
strikes me as a good opportunity to fold in those characters that Marvel was trying to develop for TV a few years ago but abandoned, like Jessica Jones (whose series would've featured Luke Cage) and Mockingbird (who'd be a natural fit for a SHIELD series). Heck, the concept lends itself to a ton of backdoor Marvel pilots.