No-one knows other than probably soon with the next update.
Refer previous discussions
Adobe does not discuss release schedules with the public.
The common guess is 2 minor releases of LR after the official release date of the camera.
See all the other threads about the "5d mark iv".
Lightroom CC (2015.7) and Lightroom 6.7 are now available and it includes support for Canon EOS 5D Mark IV.
Please update Lightroom to latest version from Help>>Updates menu.
Release notes:-Lightroom CC 2015.7 now available
Does this version include tethered compatibility? It recognizes the 5D IV, but then it says camera not detected.... It alternates between the two rapidly...
Yeah, I saw that list... Just wasn't sure how up-to-date it was, since they did just release the new version that now has support for 5D IV... Just wanted to make sure I wasn't doing something wrong, and/or things weren't malfunctioning!