Is some update will on 15 March 2013 or 18 March 2013?

Everybody are waiting to see the effect of the next update of Google. I am also waiting for the morning when Google will make some changes in their update.....

Penguin 1 on April 24, 2012
Penguin 2 on May 24, 2012
Penguin 3 on October 5, 2012

When will Penguin 4 happen?

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