Interestingly Shane Black, and Stan Winston creature effects team who were involved in the original Predator also worked on Monster Squad, Fred Dekker was also a co-writer. I read a passage in Stan Winston's book that the effects team were more optimistic of Monster Squad than they were with Predator and didn't hold Predator in high regard, ironically Predator would become more popular with Monster squad only gaining a cult status. Hope this is a project they're genuinely enthusiastic about. In a video interview with Shane Black on Ironman 3 he's asked whetehr5 or not he'd accept an offer from Fox to do another Predator film.
I'll leave the link here.
https://www.youtube.com/watch?v=Y-VwVAuDLOA 4:45
He essentially says "You don't need to do another Predator movie, You said everything you needed to with the first movie. It all really depends on whether its a story worth telling." I'm wondering if Fox will attempt to reclaim creative control, demand rewrites. I hope that doesn't happen seeing as that's what happened to this years atrocious Fantastic Four Reboot from Fox.
It'd be great once the script is approve they start filming in 2016, head into post production and deliver the film for a 2017 release, coinciding with the Original Predator films 30th Anniversary.
Though a 2017 release would also mean coming out in the same year as Alien Covenant, with the exception of the AV films this will be the first time an Alien and Predator film will have been released in the same year.