Well, Frekk, one idea being put about (by me, mostly

!) is that civics might refer to SMAC-style Social engineering where, aside from merely choosing the government you are, you also select the social elements of your society. These might include how secular/spiritual society is, how capitalist/communal, how pacifistic/militaristic, how libertarian/strict, how democratic/autocratic etc. Each one might have a setting of 1-3, 1-5 or even 1-10 to determine the degree.
Another option put forward by DH_Epic is that civics might exist through the social science part of the tech tree. You will need him to explain it in more detail, but he mentioned that, for example, when you discover Monarchy you can decide whether you take a 'right-turn' into feudal style social techs, or take a left turn into more constitutional style monarchy. The choice you take at each 'fork in the road' will help to determine the 'flavour' of your society!
Hope that helps though, ultimately, only Soren REALLY knows what he meant by civics, and only he knows for certain if it will still make it into civ4

!
Yours,
Aussie_Lurker.