hey sean, i haven't been able to pry loose the boss's credit card for my upgrade yet but the things that have me (CS-wise) are the:

Layer Comps (best feature, for me, considering the painstaking method i do now even with "layer sets")

Revamped Histograms (get to see the ramps for ALL the colours at one time)

16bit support and RAW format

there are a few "small" tweaks that intrigue me like, "variable base" dynamic graphics from layered image. PDF output of layer (easier comp presentation for clients). the ability to output a "history" of what you've done in PS (makes it easier to "time-card" client work)...

can't think of more at the moment (just woke up and not yet had my Java [that's coffee, NOT the programing language ;0]) but i'm sure i'll be back ;)

:)
retrocity