According to latest rumors Canon is working on Canon EF 16-35mm II successor, the new lens EF 35mm f/1.4L II USM lens is also in pipeline and will be announced before the EF 16-35mm II, at the moment we are not confirmed that when it is coming.
The upcoming lens will feature upgraded optics and enhanced design, the lens is also rumored to feature STM (step drive motor for auto focsuing ) for silent and fast auto-focusing.
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I can confirm that the lens is out for testing since a while.
how long come in
This Canon lens EF 16-35mm F/2.8L III wide angle would be a great open landscape lens and Weddings lens.