Adobe today has officially announced the new Adobe Lightroom CC and Lightroom Classic CC. With the announcement of Lightroom Classic CC, it means there will be no Lightroom 7 and no standalone version now. Lightroom Classic CC now already support new announced Nikon D850 DSLR camera.
And the old Lightroom 6 is the last standalone version of Lightroom that can be purchased outside of a Creative Cloud membership. There will not be a Lightroom 7 perpetual offering. Lightroom 6 will remain for sale for an undetermined amount of time, but will no longer be updated with camera support or bug fixes after the end of 2017. Lightroom 6.13 with support for the Nikon D850 will be released on October 26, 2017.