If you were hoping to grab Mega Man: Maverick Hunter X as late as possible, know that it will no longer be free to subscribers as of April 23rd. As of tomorrow, the game will be easily accessible in the "Last Chance" subsection of the PlayStation Store's PS Plus section. As a reminder, any free games obtained via PS Plus will be playable as long as your account's subscription is active. However, you will not lose them if your subscription ends and choose to renew it at a later date.
Source: PlayStation Blog