I think its obvious that the a6000 might be the successor to the NEX6 and perhaps sitting a step down from the NEX7 in some ways, but it is not and can not be the ultimate APS-C e-mount camera in the Sony lineup. It looks to be a very nice camera but the price gap alone between the a7 and the a6000 suggests that there is at least one more APS-C e-mount camera to come in the near future.
When rumors of a NEX 7 successor arose I thought that it would be a sealed a7-like body with an 30MP APS-C sensor, perhaps a touch screen and the same EVF. The realities are that it would be a fairly expensive camera and this is what I envision the a7000 to look like. But instead a well speced camera has appeared more in the sleek NEX tradition and at an aggressive price point. Its really a marketing no-brainer, as this is a camera that should appeal to many, many people. Perhaps not DPreview...they are already setting us up with preliminary digs, but I believe that, unless there are some monumental screw-up's here, this will prove to be a very successful product for Sony. When the near-hysteria autofocus elation settles into a reasonable real-world viewpoint, even that should prove impressive, or at least satisfying, feature.
I'm not trivializing the importance of fast and accurate autofocus because the bottom line is when the photographer pushes the shutter button, a sharp image is expected. We can argue about the difficulties of mirrorless autofocus with larger sensors but that is all it is...arguing. I will be so bold as to forecast that Sony's future in the camera business revolves primarily on their success in implementing mirrorless autofocus for both e and a-mount. That's the big unknown, as they already have class leading sensors and displays and they should be able to grunt out the electronics and packaging.
I hope the a6000 has made significant progress in AF but, whatever, there will be great deal of room for improvement.
I have to confess that 4K video or NO video makes little difference to me.
Bruce
