The next step is to update documentation and submit updates to the patches they have already submitted upstream to FreeBSD. ASLR is the first step in a long list of exploit mitigation technologies HardenedBSD plans to implement.
It's fine if the documentation is highly technical, I've written linux kernel drivers before :)
Stuff that would be nice but I can live without: Full disk encryption; Openbox / XFCE (It's what I use now and would like to keep using, but I could probably switch to something else without too much grief); jackd/rakarrack or something equivalent (currently use my computer as a cheap guitar amp/effects stack); Qt (toolkit of choice for my own stuff). What's the most painless way to transition to BSD for this constellation of uses, and which variety of BSD would you suggest?