We do have the ability to have a single turn to final with GBAS. It is not certified for use yet.
swh is correct, these are no cost options, so I dont know why you would not check that box. The 777 is capable, and has been for a while, so are the 737 variants, and of course, the 787 series. From what I understand, all ac currently produced by B have the MMR GLS capable installed.