Dang, I wasn't really interested on HL2 until now - had my eyes firmly set on DX2. But if everything promised in the previews makes the final cut then this game is going to kick some serious ###.
I've been won over by:
* The Strider
* The uber-cool dynamic lip-synching feature
* The character models had paritcularly nice eyes
* All the new modding features
* The promise of an enivironment where "almost everything is destructable"
* Enemies who pick things up and throw them at you
My main concerns:
* Most of the writers have done little to distinguish between AI and clever scripting in the scenes they've observed
* Most descriptions appear to be of tech-demos rather than gameplay