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.
Nope. pkgsrc-wip is more like a playground for new package maintainers, unstable packages or stuff which can’t for be imported due to license reasons. That’s why it is work-in-progress :-)
Does the work in pkgsrc-wip get brought into the pkgsrc quarterly releases?
My impression was that -wip was where the unstable work happened, while the quarterly releases was where the pkg went once it was deemed stable/ready.
pkgsrc-wip packages may or may not be brought into the pkgsrc quarterly releases, there is no formal process to do so. pkgsrc-current is the development ground for pkgsrc’s quarterly releases, and from time to time packages from pkgsrc-wip are pulled into pkgsrc-current.