UPDATE: Sony has formally revealed the full line-up, confirming that Mercenary Kings will be this month's free PS4 game.
ORIGINAL REPORT: The European PlayStation Plus line-up for April 2014 has allegedly been outed by Gamepointsnow, which seems to be a specialist in revealing future PS Plus offerings.
According to the blog, the line-up includes Mercenary Kings on PS4, PES 2014 and Sly Cooper Thieves in Time on PS3, and Hotline Miami and MotoGP 13 on PS Vita.
Not a bad selection by any means.
Mercenary Kings has also been confirmed as the PS Plus free game on the Asian store.
Expect Sony to confirm the line-up pretty soon.