shift away from "a proprietary SDK and unnecessary apps," presumably a reference to Apple's iOS and App Store, to "web fidelity and tool familiarity."
The Playbook is going to be boosting Adobe with the 'open' Adobe Air SDK, which is interesting because those are apps, which sort of contradicts their app vs web stance.
The reality is that Apple went web-only from day 1 and nobody wanted web-only. Apple has the same webkit Blackberry uses (because Apple offered it as an open product) plus a powerful App SDK that not only does apps like NFS Undercover, which you can't publish on the web but it can control external hardware, which I doubt the Air SDK will allow.
This is just another marketing ploy to defibrillate a dying brand by pointing at successful companies and claiming superiority when they are just another imitator.
The one thing the Playbook has is a dual-core CPU, which makes HTML5 run faster but it's the same attempt made by PC rivals to outspec rather than deliver a better experience. Apple's focus on iPad 1 was build quality, battery life and most of all the screen. We don't know what screen is in the Playbook but I would guess it's not IPS and it didn't look like AMOLED. What we do know is that it's 7", which is half the size of the iPad so that's going to kill the experience somewhat.
Lastly, they are playing catch-up to iPad 1, just before iPad 2 arrives and they are only managing to match the price. If they undercut it, they do so by compromising quality.