Using SSDs for next generation sure is great, but it also comes at a cost. If they aim to achive 4k and even 8k gaming the assets are going to be MASSIVE.
So the internal SSD would need quite a few TB of space or else you can only keep a few games at a time.
Which also makes me wonder what kind of optical disk they are going to use.
What kind of Blue-Rays are currently in use for PS4 games?
Anyway things are starting to get interesting. Looking forward to Microsofts answer at E3.