With "Vegapunk's" new design being similar to Sora, Sanji's mother, I think it's very likely that Vegapunk has some kind of connection with her. Either familial (Father, Brother, Mother, Sister, etc...), professional or even just an old crush/friendship.
So more Sanji lore is very likely coming this arc. Hopefully DJ/IJ's origin is explained or at least hinted at. Though mentioning hints, that Lust/desire bit that Vegapunk mentioned couldn't be controled could be the very hint itself for Sanji's emotion powered skills.
The RS is dead though, get over it.