At the presentation named "The Road to PS5", which was intended for developers and some investors rather than ordinary gamers, it was revealed by a system architect Mark Cerny that a new Sony console PlayStation 5 will feature a solid state drive (SSD). This may accelerate game loading as much as 100 times. Forget about the loading screens. Here are the full specs:
CPU: AMD Zen 2-based CPU with 8 cores at 3.5GHz (variable frequency) vs 8x Jaguar Cores at 1.6Ghz on PS4
GPU: 10.28 TFLOPS, 36 CUs at 2.23GHz (variable frequency) vs 1.84 TFLOPS and 18 CUs at 800MHz on PS4
GPU architecture: Custom RDNA 2 vs Custom GCN on PS4
Memory interface: 16GB GDDR6 / 256-bit vs 8GB GDDR5/256-bit on PS4
Memory bandwidth: 448GB/s vs 176GB/s on PS4
Internal storage: Custom 825GB SSD vs 500GB HDD on PS4
IO throughput: 8-9GB/s vs approx 50-100MB/s (dependent on data location on HDD) on PS4
Expandable storage: NVMe SSD slot vs Replaceable internal HDD
External storage: USB HDD support (PS4 games only) vs the same on PS4
Optical drive: 4K UHD Blu-ray drive vs standard Blu-ray Drive in the PS4
There are no official photos of the PS5 design yet.
Here is a video from the presentation.
And here is an example of PS5 with the SSD in action from an early Marvel's Spider-Man demo in comparison with PS4.
It is worth noting that Microsoft is also using an SSD in the upcoming Xbox Series X console with 1TB of space. This is more than 825GB in PS5 but, on the other hand, you can't connect your own drives to this system. Instead, they are going to have a proprietary drive for expanding the system memory, which sounds expensive.
However, now that the next gen consoles from Sony and Microsoft have been officially confirmed, nothing stands on Rockstar's way to announce GTA 6 for these platforms.