GNOME Maps is kind of awesome. But it’s Wi-Fi location service—powered by Mozilla Location Services, the same as Firefox’s—needs contributions from individuals who can run a little app on their Android phones. Help build an open-source location service, and make the Linux desktop and Firefox independent of Google Location Services.
When I asked several months ago about maps/navigation it was mentioned they would likely fork or contribute to GNOME Maps which uses the OpenStreetMap dataset: https://wiki.gnome.org/Apps/Maps
In short, if you want better Maps whenever the official maps app is released (it's not in their 'must have' set so might not exist at launch), contribute to OpenStreetMap. If you have any quesitons feel free to join us on Slack: https://osmus.slack.com/