Noticed it as soon as the dungeon previews came out and it's most likely old news now.
His design looks like Godzilla
The spines light up when he's about to do his fire breath attack
and he glows red when enraged much like Godzilla's look is in Godzilla Vs. Destroya is
If so that's a pretty neat little nod.
Giant Monster movies need more love, my favorite from this game is still the Gamera reference with the flying Adamantoise. :p