Seriously, I do expect they're working on a 14-24 or similar. Given that Nikon's D800 is showing the flaws in their excellent 14-24/2.8, I expect Canon is taking their time to get it right.
I would love to see this lens released in the next year or so. But expect it to cost $2,500+. Though I would gladly pay that... <24mm presents a bit of a hole in my camera bag. Even with the Sigma 12-24mm... I'd love to have something faster with better corner performance.