I like how "forces" screen was improved, applying espionage feature, so here is my suggestion for this window - what if it show basic (i.e. without *war effort) PP and oil income for all powers (including hostile ones)?
It can be calculated manually indeed ( value of core hexes + 1/2 * value of occupied hexes + offmap production), but it is very time consuming, so will be great, if game do it for you. Idea of opponent's revenue is much more valueable information, then current screen with raw number of cities etc owned, so players will probably actually USE this window.
This is just my thoughts and I decided to share them, before forgotten, nothing major here.
