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Lens design is a very specialised discipline, with Canon historically only being able to develop no more than 3 or 4 new or upgraded lenses each year.
Canon has several distinct programs of lens upgrades it wants to pursue:
Upgrading more of the wide primes (as per the 14mm L Mark II) Lots of these are relatively old designs. These sell to FF professionals and will definitely need updating as sensors climb into the 25mp+ range. The new 1Ds3 will certainly show the age of some lenses.
Upgrading the telephotos and telephoto zooms with latest generation IS. Some of these (particularly the 100-400mm ) have 1st and second generation IS and could definitely benefit from an upgrade.
A broader range of consumer and enthusiast lenses need developing fo this expanding market. There are many areas where the new affordable analogue based IS couls be used
Canon is looking at ways to expand its lens design capabilities here using new software and expanding the engineering teams in this area.
Many of the L series lenses (especially the primes) sell in relatively tiny quantities – often just a couple of thousand or less in a year. This makes the return on investment pretty limited. Canon actually makes these in single production runs where they make a year’s supply in one go.
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