That's me, thought I'd get a good deal on my 1Ds Mark III (which I did) a little before release of the 1D X, being completely oblivious to Canon's 1D announcment/delivery discrepancies...
In August, 2010 there were 5 lenses and 2 TCs announced. The TCs became available in Dec, 2010. The 8-15mm fisheye in July, 2011. The 300/400 II lenses in Nov/Dec 2011. The 500/600 II lenses started shipping in May/June, 2012 - a delay of close to two years.
How's that for a track record?
That's just what I was afraid of.