Haha thanks, we've actually been improving the terrain since we took that picture but we're still negotiating the game mechanics.
It's probably going to be a cross between a diplomacy game and a strategic warfare map. You will play metaphorical chess with the other players until you achieve some goal (we may make game goals/modes customizable). Since you'll be able to form all manner diplomatic relationships (NAP, Alliance, War, Cease Fire, etc) and there will be different mechanics to end wars (Surrender & pay reparations, Surrender territory, become a vassal state, etc) the goals we had in mind were something like capture all the major capitals of Europe between your alliance, or capture 80% of the map between your alliances, or something else along those lines.
The actual fighting will play more like a strategic warfare map (riflemen beat cavalry, cavalry beat artillery, artillery beat riflemen) but the macro will be more akin to a diplo.