I have come across this blog post in IP Kat. I surprised to see this news and want to share with my friends.
WIPO has now introduced a web option to submit prior art documents to published PCT applications at Patentscope. To submit a prior art document (before 28 months from priority date) to any PCT applications, we need to register an account at ePCT.
This really welcoming move from WIPO and it enables every users to submit closest prior art published applications. PCT applicant may reply to such submitted documents, if he wish, but those documents will be publically available.