Sony is pushing PS4 with interesting exclusivities, but the future is always part of the present in the videogames market. When a company releases a platform the work for the next one starts.
PS5 will be an alternative in some years and apparently, third party developers have already received the first PS5 devs kits from Sony.
From Marcus Sellars to the universe:
PS5 dev kits went out early this year to third party developers.
— Marcus Sellars (@Marcus_Sellars) March 6, 2018
Backwards compatibility. Sony has filed a patent in February 13th. The patent plays with the idea of testing Backward Compatibility in a mode that disrupts timing.
Future is now.