Package has been slow to port away from pygtk [1] and python2 and is one of 
the last remaining blockers. [2]

Meanwhile, upstream actually managed to port to gtk3 and recently merged that 
work to master. [3] A new release is imminent [4] so now is the time to start 
work on an ebuild.

If you are using this package, consider stepping up as maintainer *now*.
Otherwise, last-rites and removal from tree will happen soon.

[1] https://bugs.gentoo.org/708162
[2] https://bugs.gentoo.org/706462
[3] https://github.com/Nicotine-Plus/nicotine-plus/pull/106
[4] https://github.com/Nicotine-Plus/nicotine-plus/issues/99