With the next-gen games becoming more detailed and larger, the file sizes for the games increase as well. Recently released titles as GTA 5, Shadow Fall, Advanced Warfare all take a considerable chunk of your PS4 HDD (with GTA V taking about 10% of your total 500GB HDD). A month ago it became clear that The Witcher 3 would require at least 40GB of space.
The highly anticipated Bloodborne from developer From Software seems to be another space eater. An anonymous 4Chan user posted a shot of the back of the Bloodborne PS4 Blu-ray box.