Another excellent preview from Gamespot!
When Half-Life 2: The Orange Box ships later this year, it promises to deliver an impressively wide range of gameplay. First, there's Half-Life 2: Episode Two, the second part of the trilogy follow-up to 2004's blockbuster Half-Life 2. (The Orange Box will also include Half-Life 2 as well as Episode One to get newcomers up to speed.) Next is Team Fortress 2, the stylized, team-based multiplayer action game that's been in development off and on over the past decade. Finally, The Orange Box will also include Portal, the innovative first-person action puzzle game. While we've had a chance to play Portal, we hadn't seen Episode Two or Team Fortress 2 in action. Well, things have changed, and we got some hands-on time with both for our first impressions on the games.
Source:
GameSpot