There's a certain irony with the endearing lil' fan films one can find upon YouTube. Often times, the creators use stop motion animation with figurines or toys because it's more economical than building and performing within a costume. This the complete opposite situation from Ishiro Honda who opted for a "suit" because it was more practical than stop motion, the technique he originally desired.
Well, as I understand it, it wasn't just a matter of practicality, but of experience.
Gojira was basically Japan's first special-effects film, so they didn't have an existing talent base for techniques like stop motion.
One of the theories floating around is that Godzilla is in the process of regenerating in the latest photos we've seen, and he'll look different as the movie progresses. Perhaps his regeneration is from the effects of the oxygen destroyer, and this film is a direct sequel to the original.
They're all sequels to the original -- except maybe
Godzilla 2000: Millennium, which is quite vague about its backstory, although I gather that behind-the-scenes sources confirm it to be a sequel.
Let's see... in the Showa continuity, the '54 Godzilla was disintegrated and a second Godzilla emerged in '55. In the Heisei continuity, the second Godzilla emerged in 1984, although there was some initial uncertainty about whether it was the original or a second one (
Godzilla vs. King Ghidorah assumed there was only the one, but by
Destoroyah, the current one was explicitly established as a separate creature).
Millennium says essentially nothing about Godzilla's past.
Megaguirus implies that the Oxygen Destroyer was never used at all, but there's a line about "we have to make sure there's nothing left, not like last time," suggesting that maybe a part of Godzilla survived the OD and regenerated. GMK confirms that it's the original one, regenerated after a 50-year absence. The two Kiryu films establish that the first Godzilla was killed but its skeleton survived, and a second Godzilla emerged in 1999. And
Final Wars is basically a Showa offshoot that diverges sometime before
Ghidorah, The Three-Headed Monster, so it's safe to assume that its Godzilla is essentially the second one who emerged in '55 -- and who never "reformed" in that reality because it never faced the alien invasions that made Godzilla territorially protective of Earth.
Then there's the 2014 film, in which the Marshall Islands nuclear tests did not irradiate and displace the original Gojira but were instead specifically an attempt to destroy it, and in which its rampage in Japan apparently never happened. That's the only one that we can say for sure is
not a sequel to the '54 original -- although the tie-in comics confirmed that Ishiro Serizawa was the son of Daisuke Serizawa from the original film. (And there's the '98 film, but that's explicitly about a different creature that's only named after the Gojira known in Japan. And it was alluded to in GMK, so I like to think it took place in that continuity.)
(You could also argue for a sequel to GMK, which ends with Godzilla's beating heart being all that's left of him.)
That would be an interesting universe to follow up on, since it's one of the darkest and most political films in the series, up there with the '54 and '84 films. Also an unusually spiritual entry, in which Godzilla is basically the embodiment of the vengeful souls killed by the Japanese war machine in WWII, and in which other kaiju are chthonic spirit defenders of Japan.
Which reminds me... I still have GMK on my DVR from last week's marathon on El Rey. I've been meaning to rewatch that at some point.
If this is a reboot, he's probably healing from exposure to an atomic blast.
The original Godzilla's skin texture was meant to suggest the texture of skin scarred over from radiation burns.
But maybe he's not healing or regenerating at all. Maybe this is just what he looks like as filtered through these filmmakers' aesthetic sense. I mean, the skinless giants in
Attack on Titan aren't healing or regenerating, are they? That's just what they look like. I think.