As what sometimes happens after a new patch, BioWare will bring down servers for an unscheduled maintenance window starting tomorrow morning at 2AM CST.
The servers will be down for two hours on Wednesday, November 28th, 2012 from 2AM CST (12AM PST/3AM EST/8AM GMT/9AM CET/7PM AEDT) until 4AM CST (2AM PST/5AM EST/10AM GMT/11AM CET/9PM AEDT). All game servers will be offline during this period. This maintenance is expected to take no more than two hours, but could be extended.
For the thread in full, head over to the official forum.