Well, I managed to obtain an erm...
evaluation copy of this

It's for the missus not me, cause I can't stand the bleedin' game. Anyway, the game looks as though not only have they vastly improved the UI, but also the engine itself has been given a spruce-up too. The characters are a lot more developed and less 2 dimensional (personality-wise not graphically speaking) than the original.
However, it does require a faster machine than the wife's current one, so it looks as though an upgrade is imminent. Yippee!!!!!!
Funny how this was never important when I mentioned Doom 3 and HL2, eh?