Till now, i.e., 07/09/2012, no amendment has been made in the ESIC Act. Currently, if someone's gross salary is Rs. 15,000 per month, then he/she comes under ESIC. If someone's gross salary is Rs. 15,001, then he/she does not come under ESIC.
I hope the confusion is clear now. If the government amends the ESIC Gross Salary Limit, then the ESIC Department will send a circular to all the industries covered by it. It will also be published in the newspaper.
Thanks,
Vishal Singhal