Here is a quote from an EMMI email regarding this I received today:
I do not have anything to send you, but it is easy to calculate. When the last person crosses the start line, the clock starts on the 15 minute per mile pace. If the last person crosses in 4 minutes, then you would have to be at the 1 mile mark at 19:00 on the official clock. If you have a watch and start your time once you cross the start line, then all you have to do is maintain a 15 minute pace per mile.
The full and half have key points, but you can still get picked up anywhere along the course. The same is true for this race.