"What are the default username/passwords for this build?
Default username is facepunch, default password is facepunch."
It's multi-user.
You can share the iPad with others in your household and instead of being a social device in the shared nature, you can opt to return it to being a user device that many people can have their own account on.
The essence of this is that unlike the Kindle or iPad, you could access whatever you want, download whatever you want, safe in the knowledge that the next user of the device wouldn't see it.
Meaning you could share the iPad with other members of the house, and each member could have their own login with their own preferences, their own bookmarks, plugins, history, saved passwords, etc.
i guess Apple will somehow port that feature out into the iPad sometime into the future... Pretty sure Jobs did not see the iPad becoming a family shared pc substitute household device...