A new, extended version of the Episode Two Trailer Available Via Steam Half-Life 2: Episode Two advances the 16-million unit selling franchise, as Valve’s trilogy of episodic single player releases continues the award-winning story of Half-Life 2. Armed with new weaponry and vehicles, Dr. Gordon Freeman must race through a countryside riddled with an increasingly feirce Combine threat. Episode Two also includes Portal and Team Fortress 2.
The trailer is on steam right now. if someone finds a Youtube or Google Video link would help.

The trailer looks good. some very nice changes whit the lighting and physics

This is going to be a good game

EDIT: Youtube video