The user interface has been changed to utilise a more recent version of GTK+. This is the widget toolkit that Inkscape makes use of to draw the user interface on the screen. This new version brings many improvements, especially for users of HiDPI screens. Bringing the newer GTK+ toolkit to Inkscape has been an eagerly anticipated goal for a long time. It has taken much effort by the Team involved, it was a focus point of the Boston Hackfest.