Works fine to show achievements but not Leaderboards. Launching the Xcode Project directly on device, loading remote (not yet live) leaderboards without issue and submitting scores to them works fine as well.
I was hoping that rather than going through the app store distribution leaderboards with all of their limitations I could instead run it locally and add scores to test the behaviour, but even though I can edit the achievements progress locally, I can't see any leaderboards being available... One out of 3 leaderboards started beginning of this september while the other 2 leaderboards won't launch until the game launch.