Originally Posted by Craig S /t/321426/wwdc-2012-official-discussion-thread/90#post_3937692
According to Apple Insider, the new Turn-by-Turn and 3D Flyovers in the new Maps app will require a minimum of iPhone 4S or iPad 2 hardware.
http://www.appleinsider.com/articles/12/06/12/ios_6_maps_turn_by_turn_requires_iphone_4s_ipad_2_or_later.html
I figured it was too good to be true. Oh well, I've got my TomTom.