Super cool news! This and Alien: The Original Screenplay will make great companion pieces. Unexpected for sure, but very, very welcome!
While it is mildly surprising they don't seem to be going with the Boss Film design, it makes sense since by the time that came about things were likely closer to what the final film ended up as than the version of the script they're basing this off of.
I've never read any of the early Predator drafts, but I'm assuming this will be more like the small, simian-like creature with prehensile feet that could climb and swing through the trees easily before they decided they wanted something bigger to look more physically intimidating?
Also was it something from the original script or just an idea that John McTiernan had about the team originally getting to the drop zone via a C-130 rather than choppers and getting buzzed by Peruvian Migs, which caused the pilot to want to turn back until Dutch held a gun to his head and forced him to keep going as planned, eventually running through the plane an grabbing a parachute as he jumped out?