Update (30th August, 9am): The glitch in question has now been fixed overnight, returning a price point to Final Fantasy XVI on Sony’s digital marketplace.
Original article: PS Plus Extra and PS Plus Premium subscribers have in the past few hours noticed that Final Fantasy XVI is appearing as a PS5 title included in Sony's membership service, allowing them to download and play the game. Square Enix hasn't stated in any official capacity that the game is set to come to the service, and today is not the usual day for the monthly rollout — that's a few weeks away.
As such, there's a good chance this is just an unintended glitch and access will be revoked in the next 24 hours or so, but for now, PS Plus members do seem to have access to Final Fantasy XVI. It seems you need to trigger a download through a PS5 console because the web store doesn't flag any PS Plus inclusion. On the system, there are reports you can either stream the RPG or fully download it. Final Fantasy XVI hasn't had a PS Plus Premium trial, so the addition of PS Plus buttons to the PS Store listing is new.
While you do have (presumably limited) access via PS Plus, will you check the game out? Let us know in the comments below.