There were speculations about the shopping bag containing something (beside the suit) Sophia has to wear for the 4th task, but they were just speculations.
What we know for sure is that the 4th task is a sort of point of no return and it has a "comfortable solution" for Sophia to drop the deal. Again, speculations were that she might get something (evidences,...) during the 3rd task that allows her to quit the deal. But just speculations.
I don't know or remember if he said more about the 3rd task specifically, other than in the last message were he said
(in general, not just the 3rd task, the context here was the rape discussion that went wild few days ago)
Personally, beside the obvious curiosity about what the task is (after months of wild speculations

), I'm curious to see if the nature of the task is different than the previous ones: obviously the settings are different, but I'm curious to see if there is more or something different than what we saw so far (the kind of "exposing for belittling the authority figure"). I think we will have (hopefully) a better insight of Aiden's angle. That will help to see where the next tasks may go from there.