The Star Wars: The Old Republic site has been updated with the news that The War for Iokath has been delayed until April 18th. BioWare's Eric Musco wrote that the team is not currently satisfied with its overall quality and that they will be spending the next week making improvements to address the issues that are still present.
As soon as we know timing for the next maintenance I will post that information. Thank you all for your patience and understanding. We do apologize for any inconvenience this has caused. We will post the patch notes either today or first thing tomorrow so that you know what is planned for 5.2!
Players are wondering if the current XP bonus event will continue through this week as it was set to end with the launch of Iokath. In a later post, Musco wrote that they have found a way to continue the bonus event and will be testing it later today. If all goes well, it will be deployed and active through April 18th.
You can read the full notice on the Star Wars: The Old Republic site.