SCEE PS Plus Community Manager, The Frannifer, tweeted that June's free PlayStation Plus titles will be revealed next week. However, the weekly PlayStation newsletter may have tipped Sony's hand.
According to the newsletter, as spotted by Gear Nuke, NBA 2K16 and Gone Home will be free as part of the Instant Games Collection next month. These titles are listed in the source code of the newsletter.
It could, of course, be a mistake. We'll find out for sure when Sony makes an official announcement of the games that will be available for free to PlayStation Plus members.