KDD 2011 Research Track: Paper Submission FAQ
Q: Is it possible to get an extension for the paper submission deadline?
A: No, sorry, there are no extensions to the deadline.

Q: Is there an author response phase during reviewing?
A: No, there is no author response phase.

Q: When will we know about paper decisions?
A: paper decisions are scheduled to be emailed out to authors by May 1st.