I think they will. I hope they won't have new overpowered fruit but the best out of the ones we have already seen. Something like:
- Jupiter --> Enel fruit
- Mars (Gandhi) --> Azure Dragon (so Zoro gets to behead a dragon
)
- Venus (Lincoln) --> magma fruit
And so on.
Two fruits of the same kind shouldn't exist and I don't want them to steal those powers. My idea is that they were the original users of those abilities, powers that Imu was somehow able to grant them. The Ancient Kingdom created DFs in order to fight against Imu's Devils with weird powers. Hence the name Devil Fruits