Nice, though that it was done quickly raises the question of why Apple hadn't tried harder to get some (even hacky) version of this together before the release.
Apple needed to get the platform to the market and what they've done so far is everything they needed to do. They haven't even updated the whole line yet, so just give it time and let them improve the basics first (no, virtualization isn't "the basics")
As with the x86 Mac, Apple is relying on third party developers to take release full VM solutions.
They care because if Photoshop isn't available then people who use Photoshop won't buy Macs. If Linux doesn't run in a VM then developers won't buy Macs.
There are some developers who might care about Linux on a Mac. Most Linux zealots I know hate Apple and won't touch a Mac just because of ideology.
Photoshop is not at all in that category. You're comparing apples to dump trucks.