(SR2) 400mm f/4.0 FE lens prototype specs?

To get an idea of the possible size of this lens: Canon EF 400mm f/4 DO IS II USM Lens vs Sony 70-400mm lens (via CameraSize).

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I am 90% certain Sony will launch 400mm FE lens during the second half of the year. But I have yet no reliable info if this is going to be a f/2.8 or f/4.0 lens. So if it’s solid rumors you seek stop reading here.

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The only additional specs I got is from a new source. Which means there is a high chance it is not correct. But I figured it would be interesting to hear from SAR readers if such a lens would be appreciated.

The source claims he has seen the 400mm f/4.0 FE prototype:

Market release in Q3 2017
White color with “very elegant design”
aprox. 2,3 kg weight,
fast autofocus
focus limiter buttobs,
OS in lens
price aprx 4.500 usd

If true the price would be surprisingly low compared to what the Canon EF 400mm costs! But still, this rumor is still not coming from my trusted sources. I hope to hear from them soon.

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Reminder (SR = Sonyrumor):
SR1=probably fake rumor
SR2=rumor from unknown sources
SR3=50% chance it is correct
SR4=rumor from known sources
SR5=almost certainly correct!