but I'm not sure I understand where we can see that leaderboard. Will it be posted here on bitcointalk or on PD Forum?
You can see the leaderboard on the primedice site, there is a new tab for check the top 10 position called "Races". Also click the small "i" to check your position, your wagered and your current prize.
Today is the first day of the daily challenge, good luck for all the participants!