With iOS 6, Apple is replacing the previous, Google-powered Maps app on the iPhone, iPod touch, and iPad, with a completely redesigned, re-rendered, and re-imagined Maps app. The data itself is supplied by TomTom, but Apple has draw all the maps, and while they've lost some features, like Street View, they're adding new ones, like turn-by-turn navigation
Rumor has it, Apple's been wanting to add turn-by-turn for a while now, but Google would only give it to them if Apple took the location-tracking Latitude feature as well. Apple declined. Now, in command of their own geo-destiny, Apple will soon be providing free navigation for one and all, and thanks to Siri on the iPhone 4S and future devices, it'll have full on voice directions as well.