After listening to Zac's statements it is quite clear the Diego won't be playing as a Triquartista anymore.
Zac said two things that gave me the hint:
1. Diego needs to play further up wide so he can have more space.
2. He will be playing with three forwards.
Which means that Diego is probably going to be the left winger/forward.
Which leaves the position on the right open to Giovinco.
I hope it will look something like this eventually.
-----------------------------Buffon------------------------------
------------Legrottaglie-Cannavaro-Chiellini-----------------
-Caceres--------------Melo----Candreva-----------De Ceglie
--------Giovinco-----------------------------Diego-------------
---------------------------Paolucci-------------------------------
Its not my favourite lineup but it would work. De Ceglie and Caceres giving the team the perfect balance between defence and attack.
Melo staying back, Candreva roaming forward and shooting from far.
Diego and Giovinco have enough space to dribble and can link up with Caceres and De Ceglie without worrying that the back is uncovered, since there will be three central defenders ready to stop any counter attacks and Paolucci/Amauri will be receiving goal scoring chances from all angles. Candreva through the middle and the four wingers from the sides.
This really could work.