The PC version of Final Fantasy XV will include Xbox Live cross-platform multiplayer functionality. That can be deduced from a Microsoft Store listing.
According to Microsoft, the game will contain various online capabilities, including Xbox Live cross-platform co-op, Xbox Live achievements and Xbox Live cloud saves.
The PC version of the game will feature the same content as the game's Royal Edition. The edition contains the base game, all downloadable content packs, a new expanded version of Insomnia City Ruins, new first-person mode, new gear and new bosses.
Final Fantasy XV for PC releases on March 6, 2018.