Canon's Chuck Westfall has confirmed to CNET that Canon is indeed working on a replacement to the long-in-the-tooth EF 100-400 f/4.5-5.6L, though no timeline was given as to when we would see it.
Canon also plans to introduce more DO (diffractive optics lenses), though manufacturing costs have to come down before we see more “popular” type lenses. It's interesting to note that Canon has patented an EF 100-400 f/4.5-5.6 DO IS lens formula in the past.
EF-M isn't dead yet according to Canon, as they promise to introduce more lenses for the system in the coming months and years.
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