Gamespot has some impressions up. http://www.gamespot.com/pc/action/dayofdefeatsource/preview_6134306.html
In many ways, Day of Defeat: Source's presentation is highly reminiscent of that of Counter-Strike: Source. Like with that other game, Day of Defeat features moderate to minimal implementation of physics, and instead seems to focus on trying to re-create the maps and experience of the original game. The game's character models are fairly detailed but identical for each side, and the best way to coordinate with your teammates still seems to be verbally with a good headset. If it was, in fact, Valve's intention to faithfully re-create Day of Defeat, the developer seems to have more or less succeeded--the maps, weapons, and interface all seem to stay true. If anything, the game's pace actually seems slightly faster than that of the original game (which was already surprisingly fast-paced for a game that took a realistic approach to World War II battles), and that doesn't seem like a bad thing. The game is scheduled for release on Valve's online Steam service on Monday, September 26.
I really love Counter-Strike and Day of Defeat, but on some level I'd of prefered new content over ports