Package management is currently been worked and the tool[1] is stable now, at least the user facing parts.
Here's where things stand as of a few days ago[2]
There has been efforts to use dep in kubernetes[3][4]
The go dep tool has been worked on and promoted by some of the Go committers over the past year or so, but we don't really know if the Go Language designers with the clout to change the toolset have been sold on the idea yet, or if it will be vetoed later on. Some of them haven't said anything in support of it (or against it), so go dep is still really just of proof of concept.