No, Apple doesn't do mapping or splits/pace info. Also because the Watch dons't use GPS (it only uses GPS to calibrate the accelerometer) the Pace is not always accurate. The best way is to run an App like Nike+ or Runkeeper on your iPhone at the same time.
Hoping Apple does some work on it activity app as it should be able to map a run and give the pace if it is connected to an iPhone. Apple has a way to go here!