Lightroom CC 2015.1.1 included support GX85. The latest version of Lightroom CC 2015.7 so you should be able to open the raw files from your camera if you have updated Lightroom to the latest version.
Are you sure you a quoting the exact error message?
Upon further looking, it appears that my CC app is indeed not auto-updating Lightroom. If I do a direct download, I'm also not able to update it. Geez. Lame-o.
If you're looking for me, I'll be trying to figure out how to update my Lightroom.
Uninstalled Lightroom and reinstalled using the Update button in CC. Now I see all my RAW files.
AND I have the old import dialog back, which rocks. I feel robbed though.