I'm a very Conservative Investor!
The only things that we know about that lens is that Canon did announce on February 07, 2011 that they were developing a new super-telephoto zoom 200-400mm f/4 +1.4X extender.
http://www.The-Digital-Picture.com/P...ouncement.aspx
The latest that I've heard was that 1 year after Canons announcement, was that the lens was being field tested in Africa, and the date on that link was posted on Jan. 23, 2012.
http://blog.apertureacademy.com/2012...prototype.html
So.., at the rate that Canon moves, who knows how much longer? I would have to venture to guess by the end of the year with a return on your investment 9 months after that.
Rich