Found it.
https://www.jw.org/en/library/videos/#en/mediaitems/VODPgmEvtAnnMtg/pub-jwb_202102_3_VIDEO
Before 1995 they taught that the preaching work divided people between the sheep and the goats.
After 1995 they taught that Jesus would judge the sheep and the goats in the future during the Great Tribulation.
Now they (in particular Kenneth Cook) are saying that Jesus will deliver the judgment at the Great Tribulation, but that he will do so on the basis of evidence and consideration of actions leading up to the Great Tribulation, just as a judge takes time to consider the evidence before delivering his judgement.
Is this really “new light”? It’s not exactly a return to pre-1995 old light. It’s more like a corrective elaboration (dancing on the head of a pin) on the 1995 teaching. I can imagine some will take it as new light, and many more won’t even notice the difference. In recent years Watchtower has tended to signal “new light” as such in their presentation. So we may wait and see if they elevate this tinkering to the status of “new light” in a Watchtower Study article or elsewhere. Was this morsel handed out to Kenneth Cook as the new boy on the GB as a sort of baptism into the routine of announcing doctrinal adjustments? Or maybe he came up with the “new” idea himself.