The 45mm and 90mm tilt-shift lens have yet to be replaced years after the TS-E 17mm f/4L & TS-E 24mm f/3.5L II were released. A lot of people, myself included figured we'd be seeing new 45mm and 90mm tilt-shift lenses relatively soon, that obviously hasn't been the case.
We now see (thanks dilbert) that Canon continues to work on a long tilt-shift lens, and a new patent for multiple optical formulas has appeared.
- TS-E 90mm f/2.8
- TS-E 125mm f/4
- TS-E 130mm f/4
You can few the patent here.
While we haven't heard anything directly about a new tilt-shift lens, there has been some talk about a new kind of 135mm lens, which is not a replacement for the EF 135mm f/2L. There has been an optical formula patent for a 135mm APO and now a 130mm tilt-shift.
We do know something along these lines is coming later in 2017, and we hope to confirm it some time soon.