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What are you hoping they will add? You can check their campaign legality for yourself by checking Additional Resources.
Scion of Humanity is campaign legal, assuming you have the ARG.
World Traveler is campaign legal, assuming you have the APG.
That only leaves the rules themselves, which campaign leadership is unlikely to comment on.
Scion of Humanity says that the aasimar counts as human for feat requisites, etc. Traits and feats as rule concepts are about as close as you can get without being the same thing, so the same applies to trait requisites.
World Traveler is a trait which has a requisite of being human.
Therefore it all works. There's no ambiguity here.

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You simply need the Adopted Trait to take World Traveler.
If you notice the specific verbiage for Scion of Humanity, it does not open up Human Traits, but simply allows you to qualify as human for feats and spells, as well as altering your native subtype. This can be useful if you would like to make use of spells like Enlarge Person, but one would still need to take the Adopted Trait in order to pick up World Traveler.