The final release period will be between September 17 to September 25th, the Summer lazyness is finished.
I finalized in the design of the different settlements, with their respective sizes, infrastructure's levels cap, and their meaning.
Only the Space-Based Settlement type isn't done until space stations and other Dyson spheres aren't in game for now.
Actually I implementing the work on these settlements and will continue to update the interface afterward.
Edit 23:51 ET: the rules of accumulated infrastructures level into a settlement are done and implemented.
I will continue the update of the settlement's interface tomorrow.