ars got it pretty right on the dot. A couple things I disagree/comment on though:
1) Should have had graphics performance benchmarks. As for the comment on PC users wanting updated drivers and such, they should just let (ATI in this case) the GPU manufacturers write them for OS X. After all, for example, ATI distributes mobile GPU drivers to all Vista users on their website regardless of who manufactured their laptop.
2) I'd rather have a eSATA port than a Firewire 800, not a USB instead of FW800. Considering the port is there for the people who need fast storage, eSATA is more prevalent, cheaper, will be well supported soon as more and more machines implement it, and it just makes more sense etc.
Oh and I almost forgot: how would they add Blu-Ray later? I don't assume Apple is intending to make an Apple-branded Blu-Ray drive, is it? And they also didn't berate Apple for at least having a Blu-Ray drive as a CTO option on the 24" model...