I just pushed the first release candidate for RPM rpm-4.13.0 into rawhide. It now comes with the final syntax for rich dependencies. Also we merged support for file signatures in the security.ima xattr and some smaller fixes.
See http://lists.rpm.org/pipermail/rpm-announce/2015-September/000051.html
for the announcement and changes since the alpha and
http://rpm.org/wiki/Releases/4.13.0
for the overall changes.
As with the alpha release the focus for rawhide right now is not on the shiny new RPM features but on the little changes and bug fixes and their impact on existing packages.
Florian