The costumes, which are widely thought to relate to the Quantum Realm, appeared online on Twitter via user HowlStrange. The price tag on the toys indicates that these images were taken in Vietnam. Although it's possible that these aren't real or that they might not appear in the film, it's clear that these pictures were taken in a store, so these toys are out in the world.
The first set of images shows Thor is in Quantum Realm costume in addition to Black Panther, Captain America and Spider-Man. This may confirm that Black Panther and Spider-Man, who died in Avengers: Infinity War.
The second set of photos teases Hulk and Thanos with new costumes and weapons.
Clearer pictures of Thanos and Hulk pic.twitter.com/oNYWMKCfnt— Stephen N. Parker (@HowlStrange) January 20, 2019
The third set of photos give a look at Clint Barton/Ronin, Valkyrie and Star-Lord, who appears to be wearing his costume from Infinity War. The other images show Rocket Raccoon and Black Widow in their Quantum Suits.
Avengers: Endgame will hit theaters April 26. Directed by the Russo Brothers, the film stars Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Scarlett Johansson, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Chadwick Boseman, Anthony Mackie, Sebastian Stan, Benedict Cumberbatch, Paul Bettany, Samuel L. Jackson, Tom Holland, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Vin Diesel, Dave Bautista and Pom Klementieff.