Any jail can be broken out of given enough people who are pissed off and determined enough to do it. Even if it requires a hardware hack which would limit the amount of people who could do it. It would eventually be possible.

Not to mention the article you linked qgil said that it can be downloaded to PC or Mobile. Even if people didn't bother with it on the Mobile they could just do it all on the PC.

The DRM I'm more concerned about is regarding applications. Seems that you will be forced to choose between a DRM closed system and an open system down the line (if I'm reading your post #15 correctly)