If you have an account on leaf.dragonflybsd.org, the pkgsrc-wip code is available at /archive/NetBSD-pkgsrc/wip or /usr/pkgsrc/wip. (softlink)
pkgsrc-wip, as I understand it – see comments, is the current version of pkgsrc. pkgsrc is normally released with new versions on a quarterly basis; following pkgsrc-wip gets the Work In Progress version. Less stable, more up to date.