MUFC you might be right.
I have called CIC on 23rd evening and I was assured the 4/6 is from June 2015. But on their site http://www.cic.gc.ca/english/citizenship/cit-changes.asp
its still given as
Additionally on August 1, 2014, a new streamlined decision-making process for citizenship applications, measures to improve efficiency of the application process, and a new judicial review and appeals process came into effect.
In 2015, these final changes will be in force:
provisions to give citizenship to more “Lost Canadians”;
new residence requirements;
new intent to reside requirement;....etc
Now it does n't say 19 June 2015. It simply says "In 2015". Now I called CIC few days before Dec 23rd and enquired about any "new changes" that might come in the immediate future. I was told "nothing", infact assured me! Come 23rd, they increase the fee!!! Not crippling change but it just shows the CIC guys don't know anything about "tomorrow's changes".