Well, seing as we're about to see what it is next chapter, I think it's time we collected all the ranting about it in one place as well as provide a forum for all the inevitable "I told you so's!" if any one of us is right.
Personally I agree with that faction that says that her DF is the ability to attack with whatever she touches, hence Sanji looking glassed after she touched her glasses and Nami overwhelmed with bubbles while Calipha took a bubble bath.
So let's get the bloodfest started…someone's gonna have some heavy gloating to do.