Cant provide more detail till she gets back down to like 3-4k.
but after a high point of 64,500 theres gonna be lots of new features in probably all the rapids.
The whole river was rumbling beneath us at 45k and dropping yesterday & at least one huge house size boulder slid into the river after stair steps.
And the huge boulder R.right in the top part of hollywood spun to the left after the last 30k flash a few weeks ago, so it may have moved further left with this one

Having paddled the Toutle for 20 years, I doubt it changed much at all. 1500 is a great first time level. Flatwater section will be cold.

Several routes that previously contained most of the water flow at levels below 2000, in the braided areas, have much less water because of erosion of the stream bed in the other channels.
So at the tripple fork, left used to be best now middle or right is best.
The second rapid after hollywood has a hole that extends from river right to the middle of the river now.
Stair steps and tempest are both entirely different with much bigger staggered holes in different locations than before.
Oh and most of the rapids have new and fun sneak routes... But other than that & a ton of detail I left out... Its the same old toutle.