This week’s scheduled maintenance will occur on Tuesday, October 9 from 2AM CDT to 6AM CDT. Star Wars: The Old Republic servers will be down during this period and when they come back up, players will have to download a patch.
Quote from BioWare
Hello everyone, we wanted to let you know that we will be performing scheduled maintenance for four hours on Tuesday, October 9th, 2012 from 2AM CDT (12AM PDT/3AM EDT/8AM BST/9AM CEST/5PM AEST) until 6AM CDT (4AM PDT/7AM EDT/12PM BST/1PM CEST/9PM AEST). All game servers will be offline during this period. This maintenance is expected to take no more than four hours, but could be extended.
When the servers come back up, we'll have the patch notes available here. For the original post in its entirety, visit the official thread.
Update: Community Manager Joveth Gonzalez states that tomorrow's patch will include fixes to many of the issues introduced in Game Update 1.4.
Quote from Joveth Gonzalez
Just wanted to let you know that tomorrow's maintenance should bring in a lot of fixes to some of the top issues seen with 1.4. We're aiming to fix the top-reported issues found here, but keep in mind that with any update, a variety of factors could influence successful implementation. This also doesn't represent a comprehensive list for tomorrow's patch, as we have more fixes going in, but this will give you an idea of the status for top-reported issues.
Thank you for your patience!