While the official trailer reveal has yet to arrive online, several images of that Mandalorian character have. In this one, he's not in hiding or in battle, but appears to be in some sort of town, possibly.
Standing ovation for the about 3-min featurette glimpse of THE MANDALORIAN that Star Wars Celebration fans just got to see.— jen yamato (@jenyamato) April 14, 2019
Set “about five years after Return of the Jedi,” per Jon Favreau, the Disney+ series will introduce new planets, species, starships to the galaxy. pic.twitter.com/2jf4jLgw9q