They are just going to make a re-mastered version with better graphics I don't think we will see anything new :/
Even if they did develop a bit more I don't think they would add quest-lines or story quests maybe a few Digimon because that's what the game is lacking and a few other things of course ^^
According to the producer of the PS4 version they will add story quests and a total of 30 new quests and a total of 12 new digimon.
But I'm afraid 12 new digimon is not enough.