VisualArts and Key have opened a teaser website, trasing a new project as part of the Rewrite franchise. The timer ends on 15th December, which is likely when more information will be shared.
The original Rewrite visual novel launched in Japan for PC in 2011. An anime adaptation of Rewrite is currently in production, likewise a localisation of Rewrite+ for Steam in the West, an enhanced version of the original Rewrite visual novel that adds new content and improves the story. This same version is already out on PC in Japan and will be coming to PS4 next year there as well.
You can check the website out here.