It is due since long, there are rumors surfacing now and then, but nothing concrete happened so far. Canon’s EF 100-400mm f/4.5-5.6L IS lens (price & specs) should be replaced by a newer version of the lens. Now a new rumor showed up. The new EF 100-400mm could be announced together with the EOS 7D Mark II after summer or in early fall 2013. The 100-400mm will probably not be available along with the 7D Mark II, but it appears as if Canon thinks the 100-400 will fit well with the 7D Mark II from a marketing point of view. Oh, one last thing: the new 100-400mm will not be cheapCR]
Support Canon Watch! I love to bring you all the latest news about everything that's related to Canon, and to photography. If you like what I am doing here, then consider buying your gear by clicking my affiliate links. You won't pay a penny more and I get a small commission that helps keep the site going. I only link well known and reputable sellers. Thank you for your support!