Im portuguese and Porto fan so i can make you guys a resume of what to expect...
Tactically he is very good, he studies the opponent and always tries to find some flaws in order to exploit this in the game... he likes aggressive players who never stop...
Formation is 442...his favorite coach is Arrigo Sacchi that coach him in Lazio i think...442 with wingers getting into the middle and fullbacks runing in their backs...two mids, one box to box, one defensive...up front he always uses a striker that comes back, and one trying to break defensive lines with long balls...
This is Sacchi Milan and Italy, i can tell you thats pretty much the same...and its not defensive at all, like someone said...he is way different from Simeone...he was defensive just when Porto played against bigger teams...
The only bad thing about him is the mentality...Hes like Conte, sometimes gets into fights with players and refs...he is known for leaving good players out just because they didnt perform in training...and he will probably clash againt everyone if Milan dont sign this or that player he wants...
First player he will ask for is Otávio from Al Nassr, im sure... Hes better than Paulo Fonseca, but his temper can be a problem...
If its going to work and fight for the Scudetto next year? I dont think so, we are better and Inzaghi is way better...but he can make things more interesting and Oaktree need to open their wallet...