According to recent rumors from NL, Canon will replace the current EF 400mm f/5.6L USM with the new IS version: EF 400mm f/5.6L IS USM.
This is another lens from Canon, as rumored before, there will be a lot of lenses coming in 2014. This new IS version could be a bit of weight savings or length reduction from old one.
via: NL
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I seriously hope that this new IS enabled version is not too costly as compared to the existing lens….otherwise it would not really be worthwhile purchasing this instead of the non-IS lens.