1. Yes.
2. Yes. SoU adds some monsters and three new tilesets: Desert, Ruins and Rural winter. HotU adds four new tilesets: Exterior Underdark, Drow interior, Mind Flayer tunnels and Beholder tunnels. It also adds alot of new monsters like Mind flayers, Driders and Beholders.
3. By the end of the year, I believe.
4. I haven't finished the original NWN yet so I haven't got a chance to play SoU, but I've heard that it's better than NWN albeit a shorter game.
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