Latest revision of the WOFF 2.0 spec is online ...

.. and ready for your review: http://dev.w3.org/webfonts/WOFF2/spec/
Changes (since FPWD) are listed in appendix B, you can also review them line by line here:
http://dev.w3.org/cvsweb/webfonts/WOFF2/spec/Overview.html.diff?r1=1.14;r2=1.46;f=h

This version is no longer using embedded conformance stylesheet (that was always on by default), if you want to see the conformance statements highlighted you need to go to "Style" menu and select "Conformance" as your stylesheet.

Thank you,
Vlad