The trailer looks like it may actually be more about the Inquisitors than about Obi-Wan. Which is probably a good thing.
We already know how he get’s to Tatooine, the encounter with Maul on Tatooine, and how he finally leaves Tatooine. There’s a whole lot of waiting going on in-between those too. Since they have to not disrupt those time points, having lots of the show really be about the Inquisitors leaves lots of room for story, events, and surprise. Otherwise, it would be rather predictable.