Some journalists are getting access to the G29 Z4 prototypes:
Review:
https://www.carscoops.com/2018/06/2019-bmw-z4-m40i-announced-promises-purebred-roadster/
Review:
https://www.carscoops.com/2018/06/2019-bmw-z4-m40i-announced-promises-purebred-roadster/