Just a quick note for those playtesting / preparnig / etc. -
With the new Tau codex Warlord Table enabling re-rolls of certain results based upon what gear/abilities your Warlord has, we will probably revert the choice for Warlord Traits to the standard Rulebook approach. The reason for this is that while we believe rolling once while selecting 3 tables (book + rulebook inclusive) is more fair for a one-off tournament environment (aka not in leagues/seasons, or pick-up games), this new rule would force us to create a permutation for our permutation ... and that's getting too far from the basics of the game.
So, pending formalization, presume you will be handling Warlord Traits at NOVA exactly as the rulebook dictates.