Anyhow... for anyone who might be interested: I've found this on the NWN boards: The original script for Neverwinter Nights . . . before the consequences of their lawsuit (which, for this reason, I can only assume they lost) made them change it. I haven't read it yet (since I haven't played the game through, yet), but I've on the forum thread there was a consensus that it was more ambitious and more interesting than the original. Also, here's the thread where I found it, and where Rob Bartel attests to its authenticity.
I do not know if this actually does show an improvement on the actual storyline... other people who've played the game can tell me if they think it's better or not. In the meantime, having blissfully not read it, I have a game to finish (since I've only just started NWN... nobody spoil it for me!)
For the record: I'm now a huge NWN2 fan, and so far there're things that really bug me in comparison (#1: at the beginning, NWN (the original) puts you right in the middle of a huge city instead of drawing you into the story gradually... too much to absorb right away; #2: the hirelings... in NWN2 we had legitimate companions and I have a terrible feeling in my gut that all my companions will not actually be companions but rather hirelings. In NWN2 I very much liked having companions who constantly argued with one another and, most importantly, could be handled and scrutinized and manipulated, in the GUI, exactly as you can with your own character. But hirelings? And they don't even get their own individual portraits, they're all menu'd down from my own... sigh.)
Well, whatever. I'm a complainer.

I have seen that the original seems to have more in-game freedom for the player... but... in story terms and gameplay I don't see -- at least so far -- that this adds too much.
Plus: I remember earlier in the decade when developers were toying around with 3d graphics I rolled my eyes, I hated it, it was so fake-looking. All those angles. So cheap-looking. And the moving camera! Argh! To me, the camera was an intrusively extravagant feature, not only unnecessary but intrusive to the gameplay. I remember that when I saw NWN for the very first time I was turned off by all of this, although the presence of a seemingly strong and honest storytelling approach was something I appreciated (this put me on the fence as to buying it -- needless to say I never bought the game). Honestly, I still don't like these cheap graphics; however: now, strangely, I can stomach it better, maybe because I have a better appreciation. I suspect that the graphics we see today were probably made more possible by the efforts of these predecessors.
...It should be noted that before this, very sadly, I'd never even heard of Baldur's Gate. I was never a big gamer. I really wish I had heard of Baldur's Gate.
...But then again... it'd probably have distracted me from my studies.
...Just like NWN is now distracting me from my work (writing).

(Second attempt at emoticon adaptation: successful!?)