IARC will release it when it's ready, and it'll be here: https://www.iarc.who.int/cards_page/iarc-publications/ (probably here: https://monographs.iarc.who.int/ )

Important to remember that IARC just talks about the quality of the evidence, and not the strength of the effect. If they know that something does cause cancer it'll go into group 1, even if it only causes an additional 1 case of cancer per 100,000 population.

The IARC categories (1, 2a, 2b, 3) aren't that confusing, but they do seem to cause a lot of confusion. Here's a short summary I wrote in another place: https://tildes.net/~food/1774/aspartame_may_be_declared_a_po...