That means this villain probably isn’t one that’s been seen in Season 11, even if it isn’t a villain from the Doctor’s past.
A classic villain would be a treat, however, and perhaps something to quiet classic fans already upset that the series is skipping a year to finish Season 12.
One thing that does seem certain is that the “Resolution” villain is certainly one the companions or “fam” haven’t seen before, as Graham seems oblivious to this new threat.