Now every pan holder have to fill return

Please advice me as per the news which I have read in the news in Economist times 11/02/2013 under the heading Income Tax Department to quiz PAN holders not filing returns means The letters which have been sent to 35,170 PAN holders in the first phase for not filing returns and will take appropriate follow up action. There are over 12 lakh PAN ( Permanent Account Number) holders who had not filed income tax returns, the Department said, adding it has set up a nodal cell to monitor such cases.

So please tell me now every pan holder have to fill the return even his income is not under taxable or not.