Maybe the on sensor AF will be so much better that no mirror is needed anymore. Anyway, this is a rumour for 2014, so who knows? I like Sony's approach of new technology whiteout retro design in a small body very much. Actually only there QA bothers me.
I don't see the point in a mirroless A-mount only body. Pentax tried similar and it didn't go anywhere either. You don't really get a useful benefit from it.
Sony concentrating on E-mount makes sense to me, adapting to enable use of legacy A-mount equipment which will gradually die off. Of course we have the ongoing argument if E-mount can fully support FF, but I think it can be made to work if they wanted to. Bringing yet another new mount to the market is a step too far, unless they want to play in Leica territory.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
I predict they will release a FF NEX which will accept A-mount lenses via adapter. It will also accept E-mount lenses, but it will fall back to APS-C mode.
A99 already has on sensor PDAF, but if Sony completely ditches SLT, that would mean they have improved on sensor PDAF technology. If Nex-6 is not on par with DSLR in AF tracking, it doesn't follow that future version of that technology will be stagnated at Nex-6 level forever!
This would not be same as K01 which uses very crappy and slow Contrast AF.
Sony is NOT quitting A-mount. anytime soon. They recently released 500mm F4, new version of 300mm F2.8, revised 70-400mm. They are releasing new version of 70-200mm. They are releasing Zeiss 50mm F1.4 next month in July. There is no way they are spending millions on these new lenses while ditching A-mount simultaneously at the same time.
That doesn't even make sense.
My bet is that they are certain that they can match SLT AF with on sensor PDAF next year ...
The Problem with sensor PDAF is primarily at low light (or high ISO noise if you wish).