When will 5* Black Widow move to Classics?
Black Panther will be added to Latest Legends two weeks after his release, so any time between now and Monday is feasible.
Since they typically add 5s to the token packs on Thursday, I give it a non-zero chance that he will be added a week from today, but I consider it the least likely option. Most likely is around 7pm tonight - that is when the “Season” starts, and they have frequently added the new 5 at that time.
Regardless, soon.
https://forums.505go.com/discussion/59314
Pretty much if not in the data push today, expect Monday.