i don't think that will happen, the no gt5 leaderboards. well I'm hoping that they will show up in the next update or 2.
I know they will be using some sort of leaderboard for the gt academy. so in the next couple days there should be an update, or maybe it will be a free dlc for gt academy, i don't know. honestly i haven't even checked for any dlc yet.
with the complicated leaderboards from gt5 prologue. i can only imagine the headache it would be to make 80,000 leaderboards. 1 board for each car / track combo, like gt5 prologue.