CR has issued a prediction for PMA 2009, based on the rumors that they have received. PMA starts in about 3 weeks at the beginning of March, although a release of something is expected next week on February 17th/18th.
CR doesn't think the Canon EF 17-40 f/4L II Lens will be released at PMA:
"I donít think Canon needs to replace this hot selling lens just yet, there are too many other lenses that people want follow-ups to.
Again, this is their prediction based on rumors they have received.
Source: CR on 2/13/2009.