IOS 6 to be released to public on 31st july?

Recently, apple sent out a mail to all its iWork.com users saying that iWork.com would no longer be available after July 31st. It says that iCloud would now be used for all documents and data. Why would apple set a date of July 31st ? Could it be because Mac os and iOS are going to be announced at WWDC along with new macs? These new macs would hit the stores on July 31st thus giving Mac users the option to update to mountain lion and iOS users to update to ios 6 on july 31st