Check out Google’s post about their new maps feature:
Google Maps 5.7 for Android introduces Transit Navigation (Beta) and more

Be sure to check out the video in the post linked above too.

As a new resident of a city, I can tell you first hand that initially public transit can be confusing. I wish this was around when I first moved to San Diego and was figuring the transit system out. All those missed stops, all those high strung moments trying to see the next stop… Gone.