Well, according to the dates of the previous Easter events, it launched 3 days before the actually Easter date.

This year, Easter is on the 20th April, STS usually updates their games on Thursdays, the Thursday before the 20th April i the 17th April (which is fortunately 3 days before, too ) therefore I think we have to wait a few days for the Easter Event 2014 - around 10 days or so.