I just want a new 50mm f1.4L USM IS. If they can put IS on a new 24 and 28mm, why not a new 50mm or 24-70 for that matter. The IS on the new 70-200mm f2.8 Mk2 is FANTASTIC, I love it. Please listen to us Canon, we are begging.
I don't think anyone really NEEDS IS in a 50mm. If you cant handhold a 50, one of the lightest lenses around, then its not IS that you need, its anti convulsion drugs. Plus, if your shutter speed is so slow you get camera shake at 50mm, then motion blur is going to be a much bigger problem, especially if your getting camera shake at 1.4, and with the high iso of todays cameras... IS doesn't help motion blur.
IS on a telephoto lens, yes, very important. I totally agree with your statement that the IS on the 70-200 is absolutely fantastic. I have the version 1 and I love it, so i can only imagine the 2.
Which begs the question, are the new 24 and 28 IS lenses for video specifically? I don't see them being useful for stills...