Sessions is a fact witness, and therefore recused himself so he could later testify.
We do not know. There may be 5 to 8 videos. One possibility hypotheticated was that when Bill met Loretta Lynch on the tarmac, they FaceTime'd HRC and the NSA has an intercept of that video as the three of them plot to have HRC's prosecution waived off.
The other rumor is that it is a sex video from Epstein's Pedophile Island in the Virgin Islands that shows HRC (and maybe Huma) doing something really bad with a child, or leading a Satanic ritual.
Take your pick. The first could be distributed. The second is illegal to possess and cannot be distributed.