Well, I saw this before pipeline obviously, so I'll try to answer that.
NOVA is a complete new universe. It has over 400 spöb's (planets, stations, etc) and over 500 systems (neither count includes additions for the replacement of systems because of storyline universe changes).
It has six main storylines, all of which are (or, rather, will be) at least 30 missions in length. All of which are branched and forked using either divergance or success/fail forks (and if you knew how much brain power went into creating a sensible, reasonable, non-recurring fork you would be impressed). As well as all that there are generic missions, some of which link to multiple of the main storylines, and others that simply become available as your combat ability increases. As for the six main storylines, a lot of the information is actually held in the planet and bar descriptions of the universe in general.
It has six main governments: Federation, Polaris, Vell-os, Pirate, Rebellion, Auroran. It also has 5 more gövt's that make up the 5 Major Houses of the Auroran Empire; these are: Heraan, Moash, Tekel, Dani and Vella. If you can see a correlation between the number of main gövt's and the number of storylines, there's a reason for that. The cultures of the govt's have been developed through a nearly 3 millenia long history that we know (and hint at throughout the game).
We have replaced all the graphics, from the ships, to the planets and stations, to the planet scenes and interface. We have even gone so far as to replace the spash and menu screen that appears on startup. Even the asteroids are changed.
We have tried to create a scenario with both visual and intellectual hooks, where the universe itself draws you into the story and lends a certain level of realism to it all. We want this to be one of the most visually stimulating, self-contained, internally consistant and fun ev scenarios ever. We think we are a long way towards succeeding...