These new features include line numbering, text wrap around images, tables of contents, and cross-referencing. Here’s a screenshot, the first of a gallery of screenshots that might interest you. Personally, I find that initial shot of the document window with all the palettes and drawers open a little off-putting - it’s a good idea to browse through the whole gallery, then you get a much clearer idea of how some of the new features work.
I say the software’s been announced, and it has, but at the moment there’s no clear date for an actual release. The Nisus guys say there might be a beta release soon, so if you happen to bump into any of them at Macworld, be sure to nag them about it.