They're probably going to replace the head given I can't imagine the latex has held up well after three years and whatever it went through on set last time. Though I'd like if they did reuse some design elements of them since I really like the textured dreadlocks and I liked how one of them had the head designed after Pumpkin head as a callback to Stan Winston.
The Emissary are meant to be sort of Predator scientists. They're not as intimidating since they're the guys more focused on building stuff. They'd actually been a bit slender and even more mellow looking earlier on but Fox made them bit bulk them up. They weren't meant to look anything like other Predators due to this.