According to Corporation Wiki, Sony has had PlayStation PC LLC officially registered since April of this year.
Earlier this year, Sony acquired PC port specialist Nixxes Software, and PlayStation CEO Jim Ryan confirmed shortly afterward that the studio would be helping with PC ports of PlayStation games in the future.
It’s been clear for about a year now that Sony plans on bringing more and more of its first party PlayStation exclusives over to PC.
As reported by VGC, while Sony-released titles previously mentioned the PlayStation Mobile label as their publisher, they’ve recently been updated, and Horizon Zero Dawn, Days Gone, and God of War all now mention PlayStation PC LLC as their publisher.