Intrinsic on 01 May 2018
Nope they aren't.... unless you are just talking about another portable in general. But definitely not a PS4 portable. Just not possible yet.
And they aren't "pushing" the PS4 slim because they have probably accepted that they don't have to. Its still selling very well at its current price and they are making a lot of money off it.
I strongly doubt sony is going to make a portabl Playstation anytime soon again.
