The current 5G Study on channel model for frequencies from 0.5 to 100 GHz is based on (3GPP TR 38.901 version 15.0.0 Release 15), whereas the Path Loss Models in the SLS are based on 3GPP TR 36.873 V12.0.0. When can we expect to have Models based on 3GPP TR 38.901 version 15.0.0 Release 15?