@ Hareesh Mangalam
Just came across this news item at India Today website: click here
"Book your rail ticket 4 months in advance
Now you will be able to book your rail ticket four months in advance instead of two months at present. In his Budget speech in Lok Sabha, Railway Minister Suresh Prabhu today said advance reservation period has...
more... been extended from 60 days at present to 120 days to check the rising menace of touts.
Asked when the decision will be implemented, Minister of State for Railways Manoj Sinha told reporters later that it will come into force in the next fortnight."
..... So, looks like one need not wait until April 1 for availing this 120 days ARP!