Google Maps has been updated to version 9.19. With it comes a new "Driving Mode" that predicts your destinations based on where you've been before and your web search history and provides traffic updates, gas prices, and ETAs as you go. To enable it, sign out of Maps, sign back in, then check the box for it on the Navigation Settings screen (if it's not checked already). You can also make sure it's disabled if you're concerned about privacy.
Note a separate shortcut is available for Driving Mode on the Android widgets screen. You can also access it through the sidebar menu (look for "Start driving") after clicking the standard Maps shortcut.
Other features in 9.19: various interface tweaks (including the return of the mute toggle) and location history timeline settings (pertaining to data collection, among other things).