I think they eluded at WWDC that they were "pretty happy" with the way it was. (which boggles the mind).
I'd give my left testicle for a file "cut & paste".
That's not the way I saw it. I think they intended Finder to be exactly the same way with same GUI just changed to Cocoa in Snow Leopard to possibly revamp the GUI for 10.7. SL wasn't suppose to receive a GUI change and they probably want the whole GUI change to be much noticeable for 10.7. A clean codebase is a must before thinking about adding more features and a new GUI.
That's the feeling I got from them at the WWDC.
Remember they want all the new technologies to be done and get it out asap to developers, but they aren't doing it just for devs, they are doing it for themselves as well.
I consider 10.6 as phase 1 for an overall OS revamp with 10.7 being the second phase of including all the GUI stuff, front end type of stuff that Leopard had.
The only app that I think would benefit is iLife and that won't come out for a while. It's way too early to start seeing either GCD/OpenCL optimized applications. I suggest you come back in one year to ask that question.Do any of the apps on the Installer DVD use OpenCL? I'm curious to know what kind of performance increase it might provide.
(Mail does use GCD for now in case you wondering about GCD)