Given the solicitations, I kind of wonder if they're setting these stories in the "past" just so that they kind of continue on from where they left off with the Godzilla license all those years ago. They might be specifically referencing their old Godzilla run, just by virtue of setting these in the past. Maybe.
And actually, it'd be kind of neat if Godzilla mutated into a few different designs as the fight with the Hulk went on. As Godzilla absorbs more of the Hulk's radiation and it causes mutations. Starting with his more "kid friendly" 70s design, then turning into his more serious 90s design, and ending off by going full Shin. You could actually do the same thing with the Hulk and all his various changes throughout comics history. Going from "Green", to "Grey", to "Kluh" or "Maestro" or "Titan" or "Devil" Hulk. You could have Godzilla Earth versus Cosmic Immortal Hulk for the finale. I'm expecting too much out of this Hulk fight, but it would be neat if they did that.
Today's Hulk #6 gets a new kind of Hulk called Titan. As previously teased in earlier issues of the series by Donny Cates and Ryan Ottley published by
bleedingcool.com
The Hulk’s final form carries a long history.
screenrant.com