The trailer for Loki shows him encountering the TVA (Time Variance Authority) whose goal is to keep the timeline in check before things mess up badly. This Loki is the earlier Loki who we saw grab the Tesseract during the time travel scene in Avengers Endgame.
The trailer showcases several different locations, time periods and eras. We also get a glimpse of some close quarter fight scenes between Loki as well as him potentially going to Asgard.
This series looks to be spanning several time periods, even with reports of this series tying into the upcoming Dr. Strange movie. Expect to see this limited series early next year. Let us know your thoughts!