Maybe it will use Siri. Tim Cook said they were giving Siri more options. Think about it:
Me: Siri, can you direct me to get to Heinz Field to see the Steelers play? And make sure it's a fast route, avoiding traffic.
Siri: I will lead you to Heinz Field. Route 28 south is backed up with an average wait time of 20 minutes. If you get off at exit 5 and follow Lowman Street, you will reach the destination 15 minutes faster.
Me: Thanks Siri!
*as we're driving along*
Me: Siri, I need a pitt stop, can you take me to a Sheetz?
Siri: Make a left to get to Sheetz
After Sheetz
Siri: To get back on your route, turn right out of Sheetz and then turn Right onto 3rd Ave.
So Siri could do turn by turn directions and do side stops and everything along the way. I hope so!