Looks like SilverWook was right about MacQuarrie alien companion. Also looks like we'll be seeing a friendly Mandalorian female on the show. That could be awesome.
Beyond that, there's an "Agent Kallus" who seems to be an Imperial Agent/heavy trooper fellow.
Ezra's saber is an interesting design, too.
Really digging the old-school look of the vehicles, in terms of design. Everything is still pretty rough at this stage, since they're all prototypes, but I'm liking what I see so far.