I've been following that proposal, and I'm a bit surprised that it isn't mentioned on the roadmap. Looks like dynamic linked libraries will come sometime in 2.x land?
One of the other talks made reference to it[0].
[0] http://dotgo.sourcegraph.com/post/99652344343/go-team-q-a-de...
[0] https://docs.google.com/document/d/1nr-TQHw_er6GOQRsF6T43GGh...