Thinks that make you go…..
I have received two separate communications in regards to an EF 24-70 f/2.8L IS being in the wild in prototype form. We knew this prototype has existed for quite some time, however we figured the concept was dead with the release of the EF 24-70 f/2.8L II. Canon would bring this lens to market alongside the non-IS version. Canon already does this with the 70-200 f/2.8s & 70-200 f/4s, so it's possible they bring it to the standard zooms as well.
It's a bit early to talk about pricing strategy, but the new EF 24-70 f/2.8L II will drop in price over the next 12 months, as you can see by the recent big drops to the EOS 5D Mark III.
This is from a new source, take this with a grain of salt. I'm intrigued as I do know the IS version exists.
The timelines for future lenses seem to all be going into 2013, more on that later.