Android 4.2 rolling out for Nexus 7 tablet | Internet & Media - CNET News

Among other new features, Android 4.2 includes what was otherwise considered a key differentiator for the new Nook (multiple user accounts) and a Swype-like keyboard option; see this page for Android 4.2 highlights

"Android 4.2 offers several benefits over its 4.1 predecessor.
People who share a single device among themselves can log in with their own separate accounts. The latest version supports multiple users, so each person can have a unique home screen, background image, and apps."

Android 4.2 rolling out for Nexus 7 tablet | Internet & Media - CNET News