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Here is the announcement article on ePHOTOzine.com - http://www.ephotozine.com/article/sony-a7r-full-frame-mirrorless-camera-announce...
I saw them available on B&H (a U.S. Web site). Presumably they are in stores now.
Sorry this "news" took me so long to post here.
There are a couple of reviews at Imaging Resource here:
Here is a video review of them: http://www.youtube.com/watch?v=bnvgceTEV3c
If you know of a good, thorough review that I should post here, please reply/comment with a link to it.
If you want my own opinion . . . I would rather have an A99. Why? Because it has in-camera stabilization, which is something very important, since that is one of the big advantages of the Sony cameras. Besides, the A99 is really not very big. One other reason I like the A99 is the fact that it has a super-swivel screen. The A7 and A7r only have tilt screens.
One more thing . . . I'm not a big fan of tiny cameras, because I carry extra lenses. By the time you add a couple of lenses or even just a zoom lens with a reasonable range, there really is not much advantage of the smaller camera, as far as overall size and weight. I don't like to be limited to using one focal length, so I would not walk around with just a little 35mm or 24mm lens on my camera, so there really would be no big advantage of this camera for me. Oh, and I like CF cards more than SD cards.
The price of the A7 is very good though, because it is MUCH cheaper than the A99, and of course, with the A7 you get superior image quality (if you don't need the in-camera image stabilization of the A99).