A new piece of promo art for The Avengers: Infinity War features the Black Order, aka the children of Thanos.
The art features a look at Ebony Maul, Proxima Midnight, and if I would have to guess, Cull Obsidian (Black Dwarf).
Marvel did reveal the Black Order during last Summer's Comic-Con in the form of statues, where we see Cull Obsidian sort of resembles the third figure from the promo art (both have horns).
An unprecedented cinematic journey ten years in the making and spanning the entire Marvel Cinematic Universe, Marvel Studios’ “Avengers: Infinity War” brings to the screen the ultimate, deadliest showdown of all time. The Avengers and their Super Hero allies must be willing to sacrifice all in an attempt to defeat the powerful Thanos before his blitz of devastation and ruin puts an end to the universe.
Anthony and Joe Russo direct the film, which is produced by Kevin Feige. Louis D’Esposito, Victoria Alonso, Michael Grillo and Stan Lee are the executive producers. Christopher Markus & Stephen McFeely wrote the screenplay. “Avengers: Infinity War” releases in U.S. theaters on May 4, 2018.