Here is the official Panasonic Lumix Cine Camera teaser

Panasonic is teasing the launch of the new Cine Lumix camera. And they will livestream the event!

Here is the press invitation from CineGear: that clearly mentions the “Lumix” product announcement:

I still don’t know that if alon the new Lumix L-mount Cine camera we might get a new GH5/GH5s firmware update.

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In summary what we know so far:

Panasonic Cine Lumix will be announced on May 31
It’s L-mount
New Full Frame sensors
Cinematography dream gear
It’s built like a tank.