I can imagine myself buying the new 24-70 lens, but it's not top of my lens list.
Yes, I'm a little disappointed at the lack of IS, but just now I thought to myself, well I've never bitched to myself at the lack of IS on my 85/1.8 lens, which is longer (albeit faster too). I'll be able to live with the lack of IS given that the 5D3 will have way better low-light noise performance than my 7D.
Plus, this new 24-70 will be insanely sharp; of that we can be sure.
So: I've already got the 70-200 f/2.8 L IS II, and if I get the new 24-70 and a 2X extender, that combination of 3 lenses will cover basically every walk-around requirement, and give outstanding image quality across the range.
But I think I'll still get the 85/1.2L II first. Just because I want it!