From: Shing Wai Chan <shing.wai.chan_at_oracle.com>
Date: Thu, 10 Jan 2013 16:13:49 -0800

I have just submitted the Servlet 3.1 Public Review draft to jcp.org.
I will let you know once the url is public in jcp website.
The javadoc and spec can also be found in
http://java.net/projects/servlet-spec/downloads/directory/Public%20Review

Shing Wai Chan