Blizzard announced that their upcoming major patch for Overwatch requires players to reinstall the full game, and yes Blizzard stated it is for all platforms.
A note on Blizzard’s forum explains that the development team is introducing some “fundamental” and “substantial” changes that can’t be simply patched over the current game. As a result, a full reinstall is required to handle the changes on all platforms as told via an email to Kotaku, the studio called it a “remaster” patch that will affect all platforms.
The update will optimise memory, improve load times, reduce hard drive space that Overwatch occupies on the PlayStation 4, fix bugs across various maps, and make changes to support future content.
The big “remaster” patch currently doesn’t have a release date but Blizzard said that it wanted to give players a heads up in advance, so be prepared for at least a 15GB reinstall when it arrives.