First patch for FO76 came out. For consoles they changed ~85% of the game files.
The patch weighs in at a whopping 47.258GB and brings Fallout 76 up to version 1.02. Prior to the patch going live, Fallout 76 on PS4 took up 53.04GB. Post-patch, Fallout 76 takes up 53.23GB, so the update replaces much of the pre-existing file.