10,000 land provinces and 4,500 naval provinces
Time frame 1936 - 1948
Research multiple parts instead of complete units
Divisions will be composed of several brigades which can be chosen
A new resource system, requiring the purchase of commodities in an economic system
A mobilization and reserve mechanic, forcing democracies to mobilize when war nears rather than maintaining a large standing army.
Carrier air groups will no longer be brigades of carriers but will function independently
More than 20 types of brigades
You will have to defend against strategic bombing (or strategic warfare)
A simpler learning curve than previous installments
The AI can now be ordered to manage individual fronts, allowing the player to focus on fronts that interest them.
More than 150 playable countries
All countries will have to fight differently
The establishment of governments-in-exile, and rebel campaigns to retake a country