I ask because the release on Steam is for September 12.
And I own the previous games here...

Well over a year and still nada. I swear IF really doesn't care for GOG. I could go through their entire list and see many not on GOG. A separate note: Neptunia & FRIENDS for IOS has been dropped from the app store completely. It gad been flawed for years where purchases failed bug now it is long dead and buried. Wow! I swear that company must hate money. Some people would still buy dlc and gacha. (Shrug).