I think what he meant was the there's not much they could do at the moment to improve them. Considering the size restrictions, I think he's mostly right, though discrete graphics card and Blu ray would be nice...
Also, just to clarify for the OP, Arrandale is DUAL-core, not QUAD-core.
I'm waiting until after the updates because my computer's still chugging along nicely, though it's nearing the end of its life. Battery dying, slowing down, maxing out it's harddrive, and 1 Gb of RAM looking a little lightweight. Also, it's likely the last update before I graduate from University, so the last time I can get a sizable student discount! Consequently it makes sense to buy the most up to date computer while I can get a discount, which will hopefully last me longer that way without feeling outmoded. However, if my computer dies before the updates, I 'm going to have to suck it up and buy then. People are positing a 10% increase in speed, and 10% saving on battery life, which I would class as a significant increase, but lots of people don't.
I hope that aimless ramble helped in some way.