According to latest rumors Canon 135mm (B&H | Amazon) Lens is coming in first half of 2018. We do expect Photo and Imagine show (March 1-4 2018) is the best time for such lens announcement. The lens was announced on April 1996 and it doesn’t have built in IS, above all the lens is more than 20 year old and at that time there was no DPAF, so we do believe that the next version of the 135mm lens will carry advance optics, IS and AF motors inside.
BTW, if you are interested in getting 135mm lens for portrait work then you should get Sigma 135mm f/1.8 DG HSM Art Lens (Amazon) for Canon mount.
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