Canon has introduced two new tilt-shift wide angle lenses!  These new lenses are the TS-E 24mm f/3.5L II and the TS-E 17mm f/4L.  
The TS-E 24mm is a replacement “II” version of the original introduced in 1991.   Canon reports it has significantly improved operability with low distortion, consistent image quality, and reduced chromatic aberration. [...]