From
DVD Talk
"There is an interesting story about the bonus features offered on Hoop Dreams. Criterion originally authorized the filmmakers to make a follow-up piece on the key characters in Hoop Dreams. But when they approached the boys, now men, they learned that their life since the movie was as interesting as the original film itself. So the Behind the Scenes featurette that was supposed to be on the disc is now being made into a Hoop Dreams sequel, proper. Our loss becomes, hopefully, another cinematic classic."
I loved the original and I hope whatever becomes of the new footage is just as good. No word on when it comes out.