This is the first time I've grown sungold but I have a lot of B and t tomato types and from first looks it seems to be darker and more intense orange like that of the B gene. In the hybrid vigor post, Fusion Power states, grow a S. Habrochaites plant beside a Sungold plant. They will smell almost identical. I have not seen this odor in any of the other wild species. This is why I suspect Sungold is derived from a S. Habrochaites cross. Then I read this
http://tgc.ifas.ufl.edu/vol41/v41p55.html and I think maybe it is orange from the B allele from (L. hirsutum) S. Habrochaites. Starts to add up for me. Maybe sungold is a cross between (S. Habrochaites x L. esculentum) x Jaune Flamme.
craig