The poster comes from popular fan artist BossLogic on Instagram. The image features Logan not feeling so good as he begins to disintegrate beside the logo for Endgame. A silhouette of Wolverine's old pal Deadpool can also be seen in the image.
The poster was inspired by the fact that Jackman was recently listed as a member of the Avengers: Endgame cast by Google, which is more than likely by mistake. "So we all saw Google search put [Hugh Jackman] in [Avengers: Endgame]," said BossLogic in the post's caption. "It is most likely a mistake, but today I was looking up posters for X-Men: Days of Future Past and I found this... #OneCanDream."
The image of Wolverine used in the edit comes from a poster for 2014's X-Men: Days of Future past, which, coincidentally, features the the character screaming while surrounded by what appears to be dust and ash.
Avengers: Endgame will arrive on April 26, 2019. Directed by Joe and Anthony Russo, the film stars Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Chadwick Boseman, Sebastian Stan, Benedict Cumberbatch, Paul Bettany, Samuel L. Jackson, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Vin Diesel, Dave Bautista, Pom Klementieff, Scarlett Johansson, Tom Holland and Anthony Mackie.