I'll add a few points to the list I started yesterday. I'll start with an obvious one.
8.) It may not be on paper at all. It may be on some sort of portable device. Newspaper publishers have invested for years in flexible, e-paper displays that feel like newsprint but update like websites. None of the projects have come to fruition ... yet.
9.) Its readers may not be united by geography. They may be a community of interest or enthusiasm.
10.) It will shift and evolve rapidly, as its readers' needs shift and evolve.