Since 2009, Disney has been hosting their own mega-convention rivaling San Diego Comic-Con called D23, which they hold once every 2 years. Last year, they premiered the very first footage for Avengers: Infinity War that which included the famed moon throw by Thanos, which later leaked during San Diego Comic-Con. Along with that first-look footage, audiences were also treated to a bunch of promotional material for their upcoming films. Some of those materials are just now popping up online courtesy of the latest issue of their magazine. Check the ones they have for Infinity War and Ant-Man & the Wasp.
As you can see, a lot of the character designs on the Avengers: Infinity War concept art are outdated. Tony still has his bulky Mark VI (???) armor from the first Avengers film. Thor still has his Avengers: Age of Ultron look. Captain America isn’t depicted as a weary fugitive of the law. Hulk isn’t sporting his new hairdo. Chances are, this concept art was designed before any of those current designs were settled on. Regardless, it’s a nice showcase of far these characters have come.
Oh and the Ant-Man & the Wasp one is pretty cool too.