Default applications include Public Library, Browser, Periodicals (which we sort of wish was grouped in with the books), Notes, Dictionary, Handwriting, Text Memo, Pictures, Settings, Evernote Setup and Facebook Setup.
The concept in question is quite simple: a primary LCD would be visible at all times, and when the occasion called for another panel or two, they'd simply slide into view, ready to serve as a number pad, or settings control, predictive text display, or even a full-fledged split keyboard.