Marvel Studios' Thor: Ragnarok has multiple post-credits scenes. CBR can confirm online reports that the film includes two post-credit scenes, one plot-related, and one more comedic.
However, it's worth pointing out that Marvel's preview screenings do not always include all of the post-credits scenes. Some are saved for the wide release, so that the stinger isn't somehow spoiled for moviegoers before the film hits theaters. However, per Mendelson's post above, at least two post-credits scenes have been confirmed for the upcoming movie.
According to reports out of D23, Thor opened the exclusive Avengers: Infinity War footage shown there by crashing right into the Guardians of the Galaxy's ship. As such, some fans expected this Avengers: Infinity War footage to be shown after Thor: Ragnarok as part of the post-credits scenes. Mendelson also addressed this in his Tweets, writing that the footage was not shown, "not unless they are hiding it from us."
Arriving November 3, director Taika Waititi’s Thor: Ragnarok stars Chris Hemsworth as Thor, Tom Hiddleston as Loki, Cate Blanchett as Hela, Idris Elba as Heimdall, Jeff Goldblum as Grandmaster, Tessa Thompson as Valkyrie, Karl Urban as Skurge, Mark Ruffalo as Bruce Banner/the Hulk and Anthony Hopkins as Odin.