There's also remastered UI and full voice acting as an addition to the game. It's far more than a simple emulation.
And lol at the people whining about "charging for what was already in the game". Firstly, Atlus can't just use Dante because he was in the original - they have to pay for the license again. Secondly, they're paying for full Japanese and English voice acting for his appearances, which was not in the original game. And thirdly, that original release with Dante did not include Raidou - getting both would've meant having to buy the full game twice. Unless the remaster is $80, it plus the DLC will be plenty cheaper.
Good points here. I was pretty salty considering we got to play as him in the original US release. This makes it easier to digest. I like Raidou but Dante as a playable character is just more exciting for me.