We heard about this a while ago but finally Google seems to make it more public, to say it is available! I am guessing this is because the product seems now well tested with latest android series 4.1 (Jelly Bean, why this name you ask me, I say it is supposed to be mouth watering :-))
The tablet has powerful NVidia Tegra 3 Quad-core processor, 1280×800 res screen, a small 1.2 mega pixel front facing camera, microphone etc (full specs can be seen in the link below).
I think Google wanted to get this out before Apple comes out with iPad mini just to be there first but I hope they tested this well to give a good fight with Apple. Full review and specs can be seen here
http://reviews.cnet.com/google-nexus-7/
The new Amazon Kindle Fire HD is out. Except for the processor power in all respects it seems superior to Nexus 7. Especially I liked the way they changed the interface unlike other Android devices. Because Amazon has a game plan to counter Apple, they are getting this out. That is originality. I like this.
Full comparison of them here
http://www.pcmag.com/article2/0,2817,2409362,00.asp