Hello,
After some time spent playing the game, I have come to several features I would really like to see in the game:
1) Better access to research tree, preferrably something akin to civilopedia in Civ4, with cathegories, search, etc.
2) In diplomacy, it would be really helpful to see the list of techs others have and player does not, and vice versa. It is incorporated into Civ4 and it allows you quick assessment without the need to open dialog with every civ only to find out they have nothing to trade (it's tedious and annoying after some time)
3) Swichable verbose feedback in battles - like a combat log saying who does what damage to whom, round by round, to be able to analyze it after.