First of all, AWESOME.
Secondly, lots of folks are picking apart the trailer and looking at some serious nuance. But you don't have to dive too deeply for the good stuff:
The first live-action Star Wars series will take place a few years after Return of the Jedi. Whoever the Mandalorian is under his mask, he’s no friend of the Empire. The trailer shows the Mandalorian methodically making his way through former Imperial soldiers. He also has an on-board carbon freezing chamber to deal with his targets. That makes things a lot easier when turning them in for bounties.
All accounts are that the writers are keeping this series after Episode IV (Return of the Jedi) - when the Empire fell - but prior to the rise of the First Order.
I cannot WAIT for November 12th! How about you?