The River of Souls part 2 has been postponed by a week. From the from it looks like the event starts on the Europe server and they found a bug, exploit or something, that forced them to take down the Europe server, roll them back, and prevent part 2 from starting on the US server.
Europe server = beta server for us Americans (please don’t hurt me), but that what it looks like. I have not done much of phase one. I’ve done the daily quest were you run around you city and kill the Regulos spawn that enter in to the city. Other than that daily quest, I’ve been level my character.