No, there will not be any sort of onilne/multiplayer. This isn't a complete remake of the game. It's only an hd/remaster, so it's not including extra content.
It will, however, be the International version of the game, which was only previously released in Japan. It'll have the Final Fantasy X Dark Aeon quests in it.
Since it's an HD Remaster version, It will probably only contain the core features of the older ones as well. Most likely will not receive online play.
Though... A game can be changed in a few weeks before release so just have to keep hoping. But imo it's a no.