This has been being trailed for a few days. Brand seems certain to be acccused in some way given his preemptive response but there are other names in the frame (David Walliams, Noel Fielding, David Jason).

Brand, or at least his more fervent followers are claiming it's because "he's getting close to the truth". I believe there is an edition of "Dispatches" coming up (tonight?) that will detail the accusations. There's some print source that's on the story too but I haven't heard who that is.