The physical version of Cyberpunk 2077 comes with two disks, suggesting it will come with a minimum of 70 GB on the PS4.
Images that look like the PS4 version were published by Reddit user Mikeymorphin. The back of the PS4 version shows that the game will take at least 70 GB on PS4, has PS4 Pro enhancements, and will support one player initially (multiplayer mode coming to the game at a later date). This game size is compatible with 70GB of space needed on a PC.
A picture explains that the box of the game comes with a 2x Blu-Ray Disc (possibly a setup and playback disc, as in Red Dead Redemption).