Apple is also making a big deal about Siri integration with the new Maps app. The thing is, Siri was already integrated with Maps--allowing users to say things such as "show me the nearest coffee shop," and see their results on a map. In iOS 6, however, when users ask Siri for directions to a coffee shop the Maps app will also be able to supply turn-by-turn navigation, instead of just directions. Google added voice command navigation in Google Maps for Android in 2010.
The End of the Road
Apple didn't come right out and say this, but it's a good bet that Google's Street View feature will be gone in iOS 6. Maps will also be losing walking and transit directions, but Apple said during the WWDC keynote that it plans to incorporate third-party solutions into the Maps app for metro transit information.