While I'm happy to see this go forward, there is recent political trouble that may jeopardize any inclusion in FreeBSD:
http://marc.info/?l=freebsd-arch&m=142687547315822&w=2
(read the whole thread for context)
I also very much disagree with the PaX model since it's an invitation to simply turn off all the protections. But that's a separate issue stemming from the fundamental design decisions at the beginning of the project.