Hello, I'm not a dev but I work at the real airport.
There is quite a huge WIP ongoing at the moment; last summer they repaved the 18/36 rwy and installed new LED lights (aprons + taxiway/rwy lts), there is a new white facade landside.. A portion of the old terminal has been demolished, and a new one is being built. A temporary terminal has been placed in front of jetways 4 and 5 (jetways 4 and 5 have been removed actually). Originally, the plans (pre-covid) were to end this first renew phase in 2021.
http://www.milanotoday.it/foto/cultura/linate-aeroporto-foto/#nuovo-aeroporto.html