Recent rumors point to the replacement of Canon’s current TS-E 45mm f/2.8 and TS-E 90mm F/2.8 lenses by early 2014.
The Canon TS-E 17mm f/4L and TS-E 24mm f/3.5L II lenses have been refreshed in recent years, leaving the 45mm and 90mm versions quite dated.
Canon Rumors reports that new tilt-shift lenses are in the wild and undergoing field tested right now. The new lenses are rumored to be announced prior to the end of the year with availability in early 2014.