I doubt if I'd buy a kit with a 24-70 unless it was discounted enough that I could resell it to subsidize the cost of the body. I've come to prefer primes to zooms, and f/2.8 is not as fast as I often need in dark venues. I returned my 70-200mm f/2.8 MK II for that reason.
I'm guessing $2000-$2200 for one with IS, but it might be a couple of hundred less. Price does not seem to matter, buyers line up to get the latest lenses and backlogs run several months before the pipeline gets full. Then, when all the early adopters have one, the price will drop 10%.
However, I'm certain that many will buy one and love it, I am burned out after having five of the existing 24-70mm L's that were only fair.