I started with that quote but then I went to the WWDC video (follow your link) and discovered the video demo called out left/right directions rather than street names. "Turn right in 500 feet and then bear left."
So, after that I began checking information on the TomTom Navigator 7 product. The iPhone is just getting a port of the product being used on other phone/handheld platforms. There I discovered that they've never put any text-to-speech in any handheld/phone application due to processor limitations. So, "clear voice instructions" is just telling you where to turn by direction and when.
Yeah. realized it now, thanks.
I think this will be ok for me, I don't care about street names. I'll wait and see and read reviews before I invest any money (and first I have to buy me a nice iPhone when I finally get time to