There've been no rumors I've heard of Canon doing anything like that.
However, the TS-E 24 has an insanely close minimum focus distance of 8.3" (front element to focal plane...that's just an inch or two from the front element), resulting in a maximum magnification of 0.34x. Add the 1.4x teleconverter, and you've got a 34mm lens with movements that goes to 0.68x, more than the 50mm f/2.5 compact macro. And, because of the movements, you can do some really, really interesting stuff...such as fill the frame with a tiny little flower and have the whole meadow and the distant mountains all in sharp focus, all with the camera's sensor kept square to the horizon to keep the trees from leaning over.
You make me want to get one. Do you have any pictures of such?
Hmmm...nothing exactly like that handy, but here's something along those lines from some time back, with the older version of the lens.