when will common app be revamped for fall 2017 applicants?

Colleges and Universities A-Z Harvard University
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https://appsupport.commonapp.org/link/portal/33011/33013/Article/3017/We-re-refreshing-the-Common-App-System-on-July-21

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You should post more general questions to non-Harvard forums. For instance

http://talk.collegeconfidential.com/common-application/