The rumoured retail price will be $4500. I'm glad to see the lens being confirmed.
As an amateur in this nature stuff, I can't splurge $10k for the superb 500/4, and of course another $3k on a gimbal head, a high end tripod, and a fluid head. $4500 is actually reasonable! I think it's possible to get away with a Sirui gimbal head or the Wimberly sidekick on my overpriced BH-55 from RRS. Considering how much the 300PF dropped, I'm fairly optimistic here. The lens could be had for $4000 or less new probably 1 or 2 years after its release. Also copies can be obtained in the used market.
Need to really give some serious thoughts though. The 300PF with a TC-14E3 on a D500 gives 420mm, crop factor makes it the FoV of a 630mm lens. F/5.6. While the 500/5.6 PF no doubt will beat such a combination, is it worth it though?
D500: $1500 new (wow, it's that low now?)
300 PF: $1300-1500 used
And I have $1500 lying around.
So is the extra IQ worth it? We're talking about nature here, and to me the centre is all I care (please don't give me stares, I'm admittedly an amateur) I'll have to wait till real world reviews are out. Steve Perry is almost definitely going to do one.