The first wave of AVP figures in 2015 was the transition from the old bodies to new. After a few waves of AVP stuff, NECA went on to make new ultimate bodies for the Jungle and City Hunter. They make different sculpts based on different Predators.
Currently they have 5 different ultimate sculpts for Predator.
Wolf Predator (which will release sometime in 2019 and is using an all new body)
NECA then goes on to reuse the sculpts whenever they can. Which can be good or bad. As all these bodies have sculpted netting on them, so for Predators that technical don't have netting, it remains unpainted, which can mess with the look of the figure depending who you talk to.
However NECA has claimed numerous times they intend to make ultimate sculpts for the Black Super Predators from 2010, so then we will finally have net free bodies. It just won't be till 2020.
Off topic, NECA says we are going to see the special 100th figure before year's end.