The talk about filevault encryption that was supposedly withdrawn from the Black Hat conference was rumored not to have been submitted in the first place. Charles Edge now responds to

I submitted the talk, and later sent a second submission using the same system to then ask to be removed from consideration. As an alumni speaker, I know from experience that the entire Black Hat organization is run extremely well. Why they cannot find me in their system, I cannot speak to.

For those who can’t be at the Black Hat in person: their twitter allows you to keep updated on what’s happening!