With Avengers: Endgame looming on the horizon to put an epic end to Marvel's 22-movie Infinity Stones storyline, it's hard to comprehend the fact that the MCU will, in fact, continue right along once the dust has settled into a Phase 4. One of the more low-key (not Loki) exciting projects being discussed is Eternals, a big-screen adaptation of the Jack Kirby-created celestial beings that count Thanos the Mad Titan as one of their own. Not much has been said since the studio set screenwriting duo Matthew and Ryan Firpo on the case last …