That is my question too. Turn by Turn navigation seems to be SIRI based. What about older devices that don't have SIRI? Also, does the system-wide dictation feature only work on newer devices (New iPad, iPhone 4s+)?
I'm a bit disappointed that they dropped support for a 2 year old, $800+ device (iPad 1).
Looks like the voice turn by turn is for iPhone 4s and the new iPhone because of siri. So those who have IP4 are not getting it. Figures.
You and me both, especially since the hardware will run it. All about the $$$ aint it!
I think there will still be voice read-outs on the iPhone 4, just not speaking to the maps and askin for directions by voice.