My understanding is that all ‘kit’ lenses will have IS. Also definition of kit for me is a way to discount the lens which I doubt Canon would want to do with that lens for some time!
It's correct that is would be strange for Canon with their stellar IS tech to release a "kit" without it. However, since many people (including me) figure the 5d3 is overpriced in comparison to the competition and its predecessor, official body-lens combinations with a healthy discount could be a way for Canon to make the 5d3 more affordable while saving face and not discounting the core camera body after so little time.
There is a kit consisting of the 5D3 and 24-70mm f/2.8L II on its way. Depending where you are in the world, it looks like this kit will retail for just under or a bit over $6000. My wife is waiting for the kit to come out as she wants both the 5DIII and 24-70 II.
I think the kit makes sense, as there is a lot of interest in the 24-70 II. I know it is a subject for debate, but you will find that a lot of people have the view that a 24-70mm f/2.8 lens does not really need IS. One of its main use cases is for events, where shutter speeds of 1/80s or faster usually need to be maintained in order to prevent motion blur. On a full frame body, which is what the lens is targeted at, IS becomes somewhat academic. I think you could argue for IS on a crop frame body - especially the 7D - but the cost of adding IS to this lens would probably turn it into a sales flop.
I think you will find that a lot of people who bought the 5DII kit with the 24-105 f/4L will buy the 5DIII kit with the 24-70mm f/2.8L II.
