Yes, it'll be amazing, I just know it!
I'm really curious about how having more character development in the single player game (through the talking robots) is going to affect the experience.
I just loved the feeling I got going through the original being mostly alone, it felt empty and desolate and really highlighted the eventual conflict between Chell and GlaDOS. It went beyond a game to outright survival without any direct narrative.
Some of the scariest parts were when there was a moment of silent calm (mostly because you knew something nasty was coming up).
I think I'm going to play through Portal again this weekend (if I don't get wrapped up in the Warhams again)