Adobe cannot support a camera that hasn't been released yet. And Adobe never makes such announcements as to when cameras will be supported. You'll just have to wait and see.
There are some sample images on dpreview that have been processed with a special ACR 8.7 beta that is different than the ACR 8.7 RC available at Adobe Labs, so I’d expect that ACR 8.7 final and the next LR final will work with them.
What is unknown is when, exactly.
As is usual the next release of Lightroom will include the 7DII..... nothing different from any other camera release.