New word that the Canon EF 100-400mm f/4-5.6L IS lens is getting an update points to a late-2013 or early-2014 production for the new lens. The current model’s production will supposedly end soon.
This confirms word that I received earlier this spring on both the 100-400mm L and the 28-300mm L lenses. If production is set to crank up as early as this fall, then we could see an announcement of a EF 100-400mm successor in the weeks leading up to PhotoPlus 2013.
If you have additional info on the 100-400mm or 28-300mm replacements, please send word via the contact form.