According to latest rumors coming from the web, Canon next generation of tiltshift TS-E17mm F4L is coming in 2019. The lens is approx 10 years old now and waiting to be replaced.
We have already published a list EF lenses that may arrive next year. Well not only that we all know this year Canon is putting more attention towards its Mirrorless division and we may see a bunch of new Fullframe Mirrorless lenses announcement / development announcement at the end of 2018.
We will update you soon as we get any new information.
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These lenses are really need more care due to fat glass structure