x_elusiv_x :
PS5 will be backward compatible. So anything you can play on the PS4 will play on the PS5. Microsoft made the huge mistake of not making games backward compatible and paid a hefty price while Sony played that up and drew market share.
most likely not.
the drive to run game BDs is different to UHD bd's, one reason why ps4 cant run 4k BD movies ,
i dont see them keeping the older type from ps4, which would also limit capacity for games.
if they go with planned cpu/gpu setup maybe end of 2019, but i think they might update parts since we had huge gains
when it comes to processing power, so ps5 might not happen before 2021.