This thread is dedicated to all of those who whined and wailed when Nikon did not announce the D800 on October 26th.
According to Rob Galbraith who wrote that he received notice from Canon today, two of Canon's mega lenses that were announced since last February have been further delayed. The two lenses are the 500mm f/4 IS II and 600mm f/4 IS II. The notice Galbraith received doesn't even mention when the lenses have been rescheduled to be available but according to him it suggests that they "won't materialize until 2012 at the earliest."
These two lenses were actually first announced as a "work in progress" by Canon back in August 2010 then they were officially announced in February of this year but with no firm availability date other than late 2011. In May Canon finally put a shipping date of December 2011 for the two lenses but with the recent Canon notice, it seems that Canonistas or Canuts (as some like to call them here :p) will be lucky if they get the lenses in 2012.
http://www.robgalbraith.com/bins/content_page.asp?cid=7-11667-12111
Now, provided that the amount of photographers who will actually buy those lenses is small and made mostly of professionals (who in most likelihood sucked it up and continued to shoot with their existing lenses), I think this is much more annoying and aggravating than not making any announcements until the product is absolutely ready for distribution.
I'm not a professional photographer and in all likely hood I will never be. Photography for me is hobby so I'm unlikely to ever buy any big ticket items like those lenses but it's time like these that I'm glad Nikon does not make pre-announcements or pre-pre-announcements as is the case with Canon here.
PS: I do believe that Canon is notorious for these pre-announcements and continuously run into delays with their products. I believe their 8-15mm fisheye is also another example among others.