It concerns suspected sexual abuse of a minor in a notorious case that was tried back in 2008. The alleged victim never testified and R.Kelly was largely exonerated thanks to this.
The unnamed witness has been anonymous since then, but now she is coming forward to testify. Specifically, it concerns the circumstances surrounding the sex video that was recorded in which Kelly was accused of urinating on her when she was 14 years old. The video was then sold on the street and reportedly will also be played in court as evidence.
Prosecutors in the case claim that R.Kelly bribed and threatened the woman into silence in 2008. Kelly himself denies all accusations.