Looks like the conclusion of the Immortal Hulk will bring about the launch of the new Gamma Flight series on June 23, 2021, headlining Puck and Doc Sasquatch.

https://bleedingcool.com/comics/crystal-frasier-al-ewing-lan-medina-launch-gamma-flight-from-marvel/

Was hoping that Shaman's appearance in the Immortal Hulk #44 was going to bring Walter back, but it doesn't look like it for the time being anyway.

Hating Guatch!