Also @curl-6 , the official description on Square Enix sites might be a good add-on for the OP.
If you played the mobile title, OCTOPATH TRAVELER: Champions of the Continent, the game's setup may sound a little familiar. That's because OCTOPATH TRAVELER 0 is inspired by story elements and gameplay ideas from that game.
This new entry in the OCTOPATH TRAVELER series has been designed as full-fledged console and PC RPG. It takes the acclaimed story from the mobile release but reworks it to add new story content and streamlines the overall story for a more compelling experience.
It features a new script with entirely new narrative elements, including new backstories for playable characters) , as well full voice acting that brings the many twists and turns home more effectively.
Similarly, OCTOPATH TRAVELER: Champions of the Continent featured battles with 8-character parties. OCTOPATH TRAVELER 0 takes that idea and refines it to create even more strategically satisfying skirmishes.
It also brings entirely new features, such as the town building to restore your hometown - a substantial new element to the game that's fun and rewarding in equal measure.
In short, it's the best of both worlds - the amazing story and ideas of the mobile release combined with the gameplay and design that fans have come to love from the console and PC games. It doesn't matter whether you played Champions of the Continent or not - you're getting a new experience either way.
So basically, the game is a "remake/retooling/reimagining" of the Champions of the Continent mobile gacha game into a full fledged single player RPG, with of course loads of new content, added scripts and an official English dub which the mobile did not have.
I'm honestly surprised they actually went with an expanded version of what I, back then, wanted. I could've gone for a one to one port no problem.
Honestly, parts of this game like it's front-back row combat system and it's main cast(especially the villains) are why this game deserves the treatment of a full fledged release.
I don't know how the town rebuilding aspect will play into the game though since there was a similar element in the mobile game(but hugely different from what was shown) but honestly, HUGE win for my Octopath Traveler love.