Apple's M7 Motion coprocessor has some powerful capabilities that will really enhance mapping on the iPhone. 9to5 Mac points out some copy on Apple's site that suggests at least one way Maps will benefit from the new hardware:
"M7 knows when you're walking, running or even driving. For example, Maps switches from driving to walking turn-by-turn navigation if, say, you park and continue on foot. Since M7 can tell when you're in a moving vehicle, iPhone 5s won't ask you to join WiFi networks you pass by. And if your phone hasn't moved for a while, like when you're asleep, M7 reduces network pinging to spare your battery."
Apple got off to a rough start in mapping, but recent acquisitions and a good deal of time spent cleaning up errors mean the service can only improve.