Given the zoom, probably at least as heavy as a 600 f/4. The newest, lightest one of those is just under 7 lb. The 200-400 is 8 lb.
The new 600mm f/4 III is exceptionally light for what it is.
I know it would be a heavy lens, and it would cost north of $13000. And it's likely never going to be built that fast. I expect it to be a 100-500 variable f/3.5 - 5.6. Hopefully L quality but i wouldn't be suprised if it was a sub $2000 lens. ($1799 if i were to guess).
But just imagine a 100-500mm f/4 with TC. It would be every wildlife photographers dream lens. As exciting as the Canon 200-400 f/4 was when it first came out -- only this would be for their shiny new RF system. But yeah...very little chance of it happening.
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