The MCU's level of secrecy regarding new projects is legendary, even to their stars. Captain America 4 was recently confirmed to be in the works from Falcon and the Winter Soldier lead writer Malcolm Spellman scripting, but star Anthony Mackie doesn't have any details yet. In fact, according to an interview with EW, he learned about the project just like everyone else.

"I literally found out yesterday in a grocery store," Mackie said. "The checkout guy named Dwayne [was like] 'Yo, man. Is this real?!' I'm like, 'I haven't heard anything.' That's what I love about working for Marvel. They call you, they're like, 'Come to L.A. We wanna tell you what's going on.' So, I'm excited to see what happens, but I haven't heard anything."