I wasn't expecting a director's cut, there was too much tinkering right up to the last minute for it to have been re-assessed for that.
I will be delighted if the Emissary Predators footage is part of the deleted scenes, but I wouldn't be surprised if it were instead more character moments and extended scenes. As for the original 3rd act in daylight, I'm sure way too much of it is absent of the Upgrade Predator CGI to be worthwhile for inclusion.
I wonder how Shane Black's first cut would have played for better or worse. He sounded quite beat up by the end of the process.