Jonas Danielsson of GNOME wrote about how this term there are two interns working on improving this mapping program for GNOME. Amisha Singla is working on adding support for printing the route in Maps while Hashem Nasarat is working on KML/KMZ support for Maps and formalizing the UI/UX for custom layers.
Hashem Nasarat already been publishing patches to manage the display of GeoJSON overlay files from the user-interface. He's next working on KML overlay file support. More details on this useful addition for GNOME Maps can be found via this blog post. It will be interesting to see how far that work proceeds considering the development period ends in March.