The profiles will be available in the upcoming dot release of Lr.
For timing reasons, it was not possible to do a RC version of Lr to coincide with ACR 8.4 RC, so we went ahead and posted the ACR 8.4 RC (and DNG Converter 8.4 RC) by itself, including new things like new camera support, the new profiles, etc. But with the final version of 8.4 (coming soon) everything with ACR/Lr will be in sync again.