So has anyone speculated on who/what he has been hired to retrieve for a bounty?
My prediction is Luke Skywalker.
That would be interesting, but judging from the dialogue from the Herzog scene that was shown as SW Celebration (and that has circulated around YT since), Luke would be too young to qualify as his target. In the scene the Mandalorian is given a tracking forb, whatever that is, and fragments of a “chain code” that Herzog’s character points out is “over 50 years old.” Since this series takes place 5 years after ROTJ then fifty years prior would be pre-TPM. Since the trailer showed what’s most likely a Clone Wars flashback, and Mandalorian culture is implied to be a part of the overall story, I’d guess it might have something to do about Mandalore. At least Luke wouldn’t make much sense. Time-frame-wise I guess other Jedi like Anakin or Obi-Wan could be relevant, but since they’re all dead that would’t make much sense either. Though I suppose some other Jedi could be part of the plot. Side note (for the sake of speculation), Herzog says that he want’s the target alive, but that “proof of termination” is acceptable for a lower fee (which consist of Mandalorian iron btw).