As per the information issued by Union Public Service Commission, the notification for the Civil Services Examination, 2013 which was scheduled to be notified on 02.02.2013 has got delayed due to some unforeseen circumstances.
The revised date of notification will be intimated in due course.
The suspense about the proposed changes at Main Examination level and removal of optional subjects continues as the communiqué does not have any mention of related information.
However, there is nothing unusual in delay of notification for Civil Services Examination and candidates should not read into it too much as these kinds of delays often happens.
Moreover, the delay is in announcement only; the Preliminary Examination is scheduled to take place on 19th May 2013. So, you should not get moved with such information and continue with your preparation-plan seriously.