One of the Vita's best included as well.
No this isn't April fools. Sony has revealed April's PlayStation Plus line-up. On the PS4, there is 'Tower of Guns,' 'Never Alone' (review here), and 'Aaru's Awakening' ('Aaru's Awakening' is cross comaptible with the PS3). Meanwhile, the PS3 gets Bethesda's smash hit 'Dishonored.' On the Vita there is 'MonsterBag' and the best 'Killsone' by a mile, 'Killzone Mercenary.'
Source: PlayStation Plus