agree with most comments here that the pen/paper address book seems a bit out of place. i'd imagine that the swivel door to keep the address book is quite cumbersome and certainly this would add unnecessary weight. also i feel that the simplicity of the design is somewhat ruined with handwritten entries in the address book (see link below for a picture):
http://www.johnsphones.com/store/johns-address-book/item89
i'm all for minimalist designs, this phone seems to segment a very niche user base that is only interested in using phones to call people, however small that is, i'm sure there's a market. though the price point conflicts with this as i feel people in this market segment are probably looking for low price as well.
some additional comments, a video on the webpage would be nice showing the interface for navigating through an address book or adding contacts. i think the dial buttons are nice, but imho the slide buttons on the side of the phone are a bit arcane, perhaps individual buttons would be more modern.
i'm actually quite attracted to the general design of the phone, the keypad is laid out quite simply, the lcd at the top is out of the way and quite utilitarian. i'm a smartphone user myself (nokia e72), but i'd love to have this phone if it included bluetooth and i'm quite curious as to the ease of use of the phonebook because i really hate storing numbers by keypad. based on the design, it'd be nice if you offered a higher end john's phone, let's say you added bluetooth, a 5 MP camera, and a micro SD storage slot, you'd have a pretty good shot at getting some premiums for people that are looking for something fresh in comparison to iphone/android.