Honestly I am guessing that the rework of France, and Spain/Portugal added trees cost so much production time that they had to cut the rest of the Mediterranean from the DLC. Though the addition of espionage makes up for that and does make sense as to why they probably cut it. It seems like this DLC has plenty of new mechanics that I can't way to play with.
That's a fair assumption, and I'd tend to agree. Been getting back into HOI myself, and the lack of depth with the Italian tree, along with no trees for Greece, Bulgaria, Turkey, Iran and such (along with the limitations of earlier trees, namely ones which came with Death or dishonour such as Czech, Yugo, Romania and Hungary). Heck even Poland could do with a rework once the Soviets get done in the context of a Scani-Nordic workover.. At least in the context of a Med do-over, at least the focus trees from DoD don't need to be redoneor hugely overhauled, just fleshed out a little bit.
Along such work, they would also need to tweak the map a bit in this regard too. This requires more provinces in Italy (such as Liguria, Umbria, Puglia). Same in Greece (Break up Macedonias and the Thraces, maybe an interior province to make Epirus coastal), Northern Epirus, break up Bulgaria a little (north / south of Evros/Maritsa river for Plovdid/Philippopolos), facilitate Balkan war boundaries and the possibility of Greater Bulgaria, Megali Idea and Turkish reconquest. Break up of Savoy/Savoia and Nice/Nizza, and do the same with the Istria / Triesta / Carinola and Dalmatia a bit.