I saw this the other day and got really excited. We played the Sierra adventure games a lot as kids, but my parents never let us play Phantasmagoria or Gabriel Knight. I don't think I missed anything with Phantasmagoria, but Gabriel Knight has always looked great. I'm really excited to get a chance to play it.
Never played the first but I player Gabriel Knight the beast within and loved it. The story was very intriguing and immersive. The graphics of first one was a bit too oldschool for my liking but a remake can definitely change my mind. Hopefully they are able to keep the strong narrative.