I don't think it will be a twist, just a confirmation of what we have seen already. They are predator monsters when they are young but intelligent technologically advanced lizards when they are adults. This interview with the visual effects supervisor pretty much confirms it:
That's just description. I'm talking about story. I'm talking about how many plots can be generated by the concept, how much potential there is to do different stories instead of just the same "fight the monsters" plot over and over.
Look at what happened with the Borg. Originally, they were described as a species only interested in acquiring technology and not caring about individuals. They were a cosmic-horror concept, something threatening because of its great power and total unawareness of us as it tramples us underfoot. But you can't really do more than one story about fighting an impersonal force of nature, so in the very next story, they changed the concept so suddenly the Borg were interested in one specific individual, Picard. And then they kept making the Borg more and more personal, eventually adding the Queen as a more conventional nemesis. The original idea was so limited that they had to change it to generate more stories.
The problem with SNW's "they're just monsters" approach to the Gorn is that it's boring. It's not giving us anything we haven't been seeing in Alien movies since the 1980s. Sure, we get stories about characters dealing with the trauma of surviving them, or fighting to escape them, but the threat itself is superficial and one-note. It's an exercise in special effects rather than an exercise in worldbuilding or cultural exploration.