QEMU 2.0.0 is now released.
The full list of changes are available at: http://wiki.qemu.org/ChangeLog/2.0
It appears that doing a checkout of tag ‘v2.0.0’, build and install will produce a binary that reports version 1.7.9
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I did a quick look and they are pulling the version during the ./configure stage so since I am always on the master (bleed-edge) branch, my installed version shows up as 1.7.9. You will need to checkout, configure, build and install to produce a binary that has the correct version (