I am glad that you were able to see the new bags, Wayne.
From the pictures, it appears that the computer compartments of the two larger bags affect the bag depth. My problem is with the bag height (I mean the dimension from one's neck down to the waist. With the bag mounted on a person's back, from bottom to top in the Slingshot 200 AW there is space in the bottom compartment for a first row of two lenses, then the barrel of the lens mounted on the camera, then a row of two more lenses at the top of the bottom compartment. The triangular miscelleaneous or "junk" compartiment is at the very top.
But if you look at the new inside height dimension, it is reduced from the size of the Slingshot 200 AW. Lowepro added two inches to the outside height dimension and reduced the inside height dimension of the camera and lens compartment, while adding height to the junk compartment.
You have seen the bag and I have only seen pictures, so maybe this change in the ratio of space between the lens and junk compartments had to do with the allocation of space for the laptop compartment; I do not know. But if so, I wish that they would build a non-computer version with the same space as the Slingshot 300 AW. In other words, they should have left the good attributes of the Slingshot series alone since they had a winner there and just fixed the shoulder problem that people were complaining about.
The bottom line is that it appears that the largest new model will not hold my:
40D with EF 70-200 f/4L IS attached
EF 24-105mm f/4L
EF-S 10-22mm
EF 50mm f/1.4
whereas the Slingshot 300 AW will, but will kill my should in the process of using it.
Also, they are apparently taking away the neat built-in rain cover.