Sony had asked Japanese fans to vote for the games they’d like to see made available in the monthly lineup of free games for PlayStation Plus subscribers. The top three titles that were selected were Killzone: Shadow Fall, Child of Light and the PS4 version of Gravity Daze (known as Gravity Rush Remastered in the West). As a result, these three games will be available to download for free for PlayStation Plus subscribers from Wednesday, July 5, 2017 to August 1, 2017.
And no, this has nothing to do with US/EU/Asia region.
From the page:
The top three PS4 Freeplay titles voted by users from the period of February 2014 to May 2017 will be redistributed in addition to the regular titles that will be distributed in July.