It has been added to Camera Raw 8.8 and DNG converter 8.8. So I suspect it will probably be added to the next release of Lightroom, whenever that might be. In the meantime, you can download DNG converter 8.8 and create DNG copies of your raw files that you can use in Lightroom now. No one knows when the next release of Lightroom will be. A lot of users anticipate that it will be soon, but there is nothing from Adobe giving any hint of a release date.