As ever, this Add-on brings needed bug fixes and new nice features.
CGM let you "Mod" easily your startnation to your liking.
BattlePlans are of great use for AAR's writer.
Better ai in many fields.
New game features like Armour/Penetration make tanks more realistic and important.
And if you like Mods out there, these will move on to this expansion anyway. ;)