There is also a question of Dr Doom, where is he? Since a lot of the Fantastic Four trailer seems to be about them already being saviors of the world, maybe Dr. Doom is on the ship we saw in the post-credits, and The Fantastic Four will show up later in a different ship.
Yeah. So it’s already confirmed that the Fantastic Four we’re going to meet in “Fantastic Four: First Steps” are in a different universe. So the retro future 60s is unique to that universe. So none of the heroes we’ve come to know exist in that universe.
There is a scene in the latest Fantasy Four trailer that looks like the Earth blowing up and a Fantastic Four ship just outside the Earth.
So the obvious setup is that the Fantastic Four will fail to save their Earth (from Galactus) and end up in the main 616 universe, which may be what we saw in the Thunderbolts* post credits scene.
Of course it may not be that simple.