Prototype have revealed that their upcoming PS4 version of Clannad will contain English subtitles alongside the usual Japanese text. In a tweet, Prototype suggested it was a useful tool for Japanese gamers to learn English while also being recommended for those outside of Japan.

Here is the tweet:

なお、PS4版「CLANNAD」は英語にも対応していて、1プッシュでテキストの日本語←→英語切り替えが可能です！
（ボイスは日本語のみとなります）
英語の勉強に役立てたいかた、海外からお越しのかたにもお勧めです！https://t.co/EBESgYWqlS pic.twitter.com/0p6mCsUTKc

— 株式会社プロトタイプ (@PROTOTYPE_info) March 23, 2018

Furthermore, an Amazon Japan product listing (translated by Gematsu) reveals more information about the game, including that it will have the Dangopedia that was first included in the Steam release.

Here is the info, via Amazon Japan:

• Full HD Support, The Series’ Highest Resolution – All images will support 1920×1080 pixels full HD, the series’ highest resolution. Experience the never tired and moving story with more beautiful visuals than ever before.
• 5.1ch Surround Sound Support – All music (background music and songs) and some voices support 5.1ch surround sound. Connect a surround speaker system or 5.1ch headphones to your PlayStation 4, and get wrapped up in the beautiful background music. (You can switch between stereo for music and monoaural for voices.)
• Text Support for Both Japanese and English – Text supports both Japanese and English languages, including the digital manual (voices are Japanese-only). You can even switch languages during gameplay. There is also a “Dangopedia” feature that explains Japanese culture.

SOURCE