I just read something very dismaying over on the Dakka forums about some fluff regarding the Tau being shoehorned into the Pre-Heresy timeline, how the Emperor intended them to be the "ultimate weapon" against Chaos and the corrupting powers of the Warp and how the Ultramarines are supposedly going to be their minders/babysitters/guardian faeries…
Oh, but there's more…
Evidently GW has to sign off on all W40KRPG fluff, and if they say the Tau and the Ultramarines are kissing cousins then FFG has to reflect such in their ongoing fluff. Da feth, you say!?
New Canis Salient Talent (Ultramarines): Butt Wiping the Tau, Cost: Your Dignity.
Anyone?