- Certainly, losses and other statistics. I liked the detailed analyses of combats that were available in AoD; even if they were somewhat 'made up', they made it feel less like a game and more like a war - besides, inaccurate loss statistics were historically highly common on both sides, usually overestimating the enemy's losses. Perhaps in addition to just soldiers, this could include vehicles and aircraft lost, too?
- Naval rebalancing - keep all the different kinds of ships useful, perhaps by lowering the production time of the 'lesser' vessels, make ships defending against carriers use their air defence rather than sea defence stat and increase the air defence and attack of carriers while reducing their sea defence hugely. It would also be useful to re-introduce the 'small CAG' brigade for CVLs/CVEs and make this upgrade at the same time as the regular CAG, so that older CVLs/CVEs are of some use.
- I miss the support and events for the Cold War and a 'Cold War Goes Hot' situation that other games in the 'HoI2 series' have had, though I'm sure DH can make it better. Ideally, this would include some support for ahistorical victors - a successful and powerful Britain or France being the main 'Western' protagonist against the USSR, for example, or a Cold War between a victorious Germany and the United States.
Interface suggestion will be forthcoming.