Image via Fotosidan
At the G9 presentation in Europe Panasonic assured the new 50-200mm lens will be released in 2018. The Leica lens was already shown earlier this year (image via Personal View):
Panasonic Preorder links:
Panasonic G9 at BHphoto. Amazon. Adorama. FocusCamera.
Panasonic-Leica 200mm lens at BHphoto. Amazon. Adorama. FocusCamera.