Marvel studios released a new poster from Loki, featuring Tom Hiddleston of course.
Size: 1687×2500
Just two days ago, a new trailer was released, which features few new scenes, including Loki visiting a ruined (or abandoned) Asgard, probably in the alternate timeline he created when escaping with the Tessereact, because in the current timeline of the MCU, Asgard was completely destroyed in the events of Thor: Ragnarok.
Check out some UHD screencaps from the Loki trailers here.
Another poster was just released: