Thor: Ragnarok features two post-credit scenes.
The first appears to be Thanos ship possibly attempting to acquire the Tesseract that Loki might have taken before the fall of Asgard.
The second features the Grandmaster in the junkyard following the "revolution."
Now director Taik Waititi reveals they were actually going to do the Grandmaster Thor: Ragnarok post-credit scene different, which I think actually sounds a lot better.
“We were determined to not have too many of them. The thing [with Loki and Thor], that was the thing we did in reshoots. It was a last minute decision. And the other thing at the end, with The Grandmaster, was something we shot on Gold Coast that was something I planned for a long time. It was either going to be that or it was going to be Topaz and Grandmaster stowing away on the ship at the end.”
Taika Waititi further reveals they filmed the scene and that it may be a bonus feature on the Thor: Ragnarok Blu-Ray:
“That could be on the DVD in the deleted scenes, those two in the crowd of the Asgardians and he pushes through and goes, ‘I’ve never heard of this Earth place but… We got to keep a low profile.’ And they kind of put these blankets over their heads and disband into the crowd."
Thor: Raganarok has a November 3, 2017 release directed by Taika Waititi starring Chris Hemsworth as Thor, Mark Ruffalo as Hulk/Banner, Tom Hiddleston as Loki, Idris Elba as Heimdall, Cate Blanchett as Hela, Tessa Thompson as Valkyrie, Jeff Goldblum as Grandmaster, Anthony Hopkins as Odin and Sam Neill in an unknown role.
Thor's world is about to explode in Marvel's Thor: Ragnarok. His devious brother, Loki, has taken over Asgard, the powerful Hela has emerged to steal the throne for herself and Thor is imprisoned on the other side of the universe. To escape captivity and save his home from imminent destruction, Thor must first win a deadly alien contest by defeating his former ally and fellow Avengers... The Incredible Hulk!