Be curious to see how 3-6-1 would do against Milan.
3-5-2 really hasn't worked against them and their 4-3-3.
Putting the extra man in midfield might cause Milan to pull Boateng into a central area - to try and avoid being overwhelmed in there - and make their system more of a 4-3-1-2, which would make for a much more comfortable tactical match-up for Juve and their back three.
Hope Juve do play 3-5-1-1 and Milan do start 4-3-3 because I would like to see if putting the extra midfielder in the team will help Juve against decent teams playing wingers and there aren't many opportunities in Serie A for that experiment to take place.