Indeed, Lightning Returns: Final Fantasy XIII is finally releasing for Windows PC in December. After multiple delays, Square Enix decided to break the silence and let the producer Yoshinori Kitase to make an announcement on the official Twitter account:

“It’s time for a status report about Lightning Returns: Final Fantasy XIII development. We’re currently in the finishing stages of the development and it seems that we’re able to release the PC version in December. Perviously, we announced that the game would be releasing in Autumn, but we have kept you waiting – we’re really sorry about that. More information will be shared soon!”

–Yoshinori Kitase, Final Fantasy XIII Trilogy Producer

Originally, Lightning Returns: Final Fantasy XIII was released for Xbox 360 and PlayStation in early 2014. The game is also available for devices supporting PlayStation Now such as PSVita and PlayStation TV.