By now it is public knowledge that there will be no in-house replacement for routing via public means of transport in iOS 6. Indeed if you hold an iOS 6 phone (that somebody maybe has left in a bar) and you try to plan a route from point A to point B you find that you can drive there quite nicely with turn-by-turn in 3D. You can walk there. Or you can get forwarded to a – currently empty – section that supposedly will show a list of transit apps to take on the routing.
I have some personal experience with that to share which might also underline why this move by Apple is actually the only reasonable one.