That'll require GTK+3 at least. They're still using GTK+2. According to the roadmap it's scheduled for Inkscape 1.4. At the current pace it'll take years to reach 1.4 IMO.
Actually, we plan to release 0.93 with gtk3. The current devel version (trunk) already dropped all gtk2 code.
Otherwise a superb product, in particular if you are on Windows or Linux and you can't run Sketch.