Well, I guess this is good news. I don't currently have much use for a 45 TS-E at all, but I do frequently use my current 90 TS-E. It is just about perfect optically. Perhaps new optical coatings, a slightly greater image circle to extend the sharpest image area even further off-axis and, of course, the new TS mechanism allowing independent control of movement direction, would entice me. But, at what cost? Now, with moderate lens movement, there is no sharper lens that I've seen in the Canon line-up. I'll just have to see for myself, but Canon will have a hard time convincing me to part with my Version I of this lens.
As to what other lens focal length that might fall into the TS-E lineup, I'd definitely vote for one in the 135-150 mm range, as for product photographers of all sorts, this focal length proves just about the best for full frame images of "things." At those focal lengths perspective distortion is greatly minimized, and room for lighting the subject is increased. Furthermore, I've also been lusting after the 17mm TS-E for my occasional architectural work. Looks like I'll have to think seriously of new ways to finance my lens wish-list program, before my wife decides to trade me in on a Version II.