Here's what happened: I was driving a 2011 135i in the morning- as I had been for the last 2 and a half years- so I was very used to the way the traffic screen worked on that car.
I'm not saying it was perfect- but it did work to a reasonable degree. That is to say, it would show traffic that was close by- and was accurate about 75% of the time
In the two weeks I've been driving the 2013 335is, the traffic feature has never produced relevant results- not once.
I should probably post this over in idrive section......
2015 M4 Vert