Panasonic director Yamane explains the difference between GH5II and GH6

He makes it clear the GH5II is meant for Vloggers and the GH6 for professional videographers:

Preorders:
GH5II at BHphoto, Adorama, Amazon. Calumet DE, Park Uk.
GH6 at BHphoto.
25-50mm f/1.7 MFT lens at BHphoto.