It will feature dual camera ( 1 on the front, 1 on the back) a 1.5GHz quad core proccessor, android 4.3, wireless chraging and a slim video port out.
4GB of RAM? but I'm not sure about this one.
Supposed to be on sale july 31st.
We will know for sure about all of this tomorrow after the confrence that's supposed to announce all of the new stuff.
Source: http://www.androidpolice.com/2013/07/19/leak-suggests-new-nexus-7-will-have-android-4-3-dual-cameras-slimport-and-wireless-charging-on-sale-july-31st-at-staples/
http://www.androidpolice.com/2013/07/18/heres-the-sticker-from-the-new-nexus-7-video-showing-what-looks-like-4gb-of-ram/
It's two gigabytes of RAM. Not going to copy-paste that, just look here. :)