Well we only know 1 grade of quality, so that won't change from we already do.
Features equate to costs and we are trying to keep them down and we do not want to offer yet more versions of the same upper or lower as that defeats any chance of more production.
Personally I can see no benefit to the forward assist at all. To close the bolt quietly can be accomplished with both our side charge version as well as the rear charge rifles, assuming that the bolt is properly fitted and lubed, it can be pushed into full battery by thumbing the cut out in the bolt carrier forward if need be. If more force is required there is an ammo problem.