I got fed up waiting and picked up a 17-40 in December... I'm liking it a lot, but not loving it. I will wait for these putative lenses to be released, do the rounds, and maybe pick one up after a year or so (once the price is stabilised, and they become available here in India).
I am more interested in the 16-50 IS than the 14-24, but lets see what they are like once they are released! This year perhaps???