Zodiac isn't 3.0, which is why DRK, AST and MCH did not get Zodiac weapons.

RDM, and whichever new Job(s) we get, are 4.0-exclusive, so as such, they will have neither Zodiac weapons nor Anima weapons, and their "relic" will be the second available tome weapon, just like Ferdinand for MCH, Atlas for AST and Deathbringer for DRK were.