SELinux, APParmor, and Policy Kit were included in Hardy mainly for Enterprise use. I.E., for those that already know well how to use/administer a huge network. You can use them on a small desktop system of course, but there really is not that big of a need because Linux is pretty secure in general; certainly secure enough for home desktop systems. You'll notice too that Hardy also includes preconfigured support for a large variety of networking systems - SSH, NFS, samba, and fuse to name a few. There's improved virtualization support and Pulse Audio to play with too. For all of these there is quite a lot of information available via Google.