A new report at Northlight suggests that Canon has prioritized the replacement of their “old” tilt-shift lenses, the TS-E 45mm and TS-E 90mm. These upgrades could match up wellwith the EOS 5DS & EOS 5DS R.
It's also suggested that higher end glass supplies is limiting the introduction of more top end lenses being added to the Canon lineup. Canon does have new manufacturing capabilities, but the increase in production is a gradual one.
I agree with Northlight, and don't think we'll see these redone this year, but an advanced announcement is always possible.