Leaderboards have been extended to all courses and are no longer limited to top speed shootouts. This is a "best lap time" system. On courses that are not top speed shootout circuits, the following information is displayed every lap:
1) Current lap time
2) Best lap of session
3) Your rank relative to the world record lap
4) Your all time personal best lap
5) The world record lap
All of the information is refreshed every lap, so it's possible that your rank and the world record will change from one lap to the next even without restarting the time trial.