ICS in its Civ 2 state will not exist but there is bound to be an alternative.
In all the screenshots we have seen the cities are all small even in later ages. There has to be a reason for that since hard to fill food boxes are supposedly a thing of the past. If the buildings that lift size expansion caps are hard to research or build then the big city strategy is going to be impossible too. Instead we get some middle road where expanding as many cities as possible to size 8 becomes optimal.
Once you hit a ceiling its obviously better to have more cities rather than less. The border cities then maximise culture to protect the culturally weak inner core which churn out the military and group them into plenty of armies. Owning plenty of coastline may become advantageous because it forms a solid barrier to cultural encroachment from that direction. We will just have to wait and find out.
__________________ To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection. H.Poincare