Found this article.

People who don't use the transit options are going on about how people know their routes anyway. Uh, way to miss the point. I use the transit feature to go to places I've never been using public transportation, not places I know.

An article that quantified the change:

In iOS 6, Apple no longer uses Google’s traffic, transit, or street view features, switching instead to their own traffic data, and adding turn-by-turn navigation and a 3D Flyover view. As a result, features will be lost in dozens of countries:

Transit: Removed from 51 countries with 4.8 billion people.
Traffic: Removed from 24 countries with 2.4 billion people.
Street View: Removed from 41 countries with 2.9 billion people.

Last edited by Saria; 09-19-2012 at 06:24 PM.