Complex sentence: While seldom used on PlayStation 3, Sony have announced that Remote Play on PlayStation Vita will be a mandatory feature for all PlayStation 4 games, except for games that will utilize peripherals, such as PlayStation Move, that cannot be replicated on PlayStation Vita.
Split into simpler sentences: While seldom used on PlayStation 3, Sony have announced that Remote Play on PlayStation Vita will be a mandatory feature for all PlayStation 4 games. The only exception to this policy that has yet been stated is for PlayStation 4 titles that will utilize peripherals (such as PlayStation Move) that provide functionality that cannot be replicated on PlayStation Vita.