Got on the Class III section of the Nooksack yesterday (Douglas Fir Campground to the Green Bridge.)  A few changes to report:

The most significant change is to "The Nozzle" which is the rapid you hit right as the river narrows down and enters the true canyon.  (about 3/4 mile below Douglas Fir CG.)  Before, most of the water went through the RR channel.  Now, the left channel is getting about 1/3 of the flow and leads into a boulder garden that ends in a steep drop.  No place for newbies!  The RR channel is more difficult, too, as there's a hole at the top that pushes you further right into the fan rock (or rooster tail at higher flows) just downstream.  Again, no big deal except for Class III newbies.  However, I'm not sure you'd see if there's wood in-play at the bottom until after you've committed to running that side of the drop.

Here are some photos:  https://picasaweb.google.com/doggievacation/NooksackCanyonTheNozzle#

There are changes in channels in the open braided section below the canyon, but no real wood issues, just some scrapey spots.