How has the wanted system changed?
Crimes are more witness-dependent and police reactions are less automatic.
Rockstar North describes a complete overhaul where unseen crimes do not automatically create the same response.
The evidence
Explicitly stated by an identified primary source.
FamitsuFamitsu interview with Rockstar North co-head Rob NelsonEL PAÍSEL PAÍS visits Rockstar North for a GTA VI demonstrationRockstar GamesGrand Theft Auto VI official siteRead the full supporting guideWhat would change this answer?
A full Rockstar systems guide or final-game testing.