Next-Generation Online has posted a Q&A with Wes Eckhart, Nova Logic's producer on Delta Force 2. The questions are of a general nature, but Wes does talk about the competition a little, and there's some interesting talk about the gameplay as well. Here's an excerpt I got a kick out of, since it was something I certainly wanted in the first game:

"Another feature that's going into the game by popular demand is bullet penetration. Some Delta Force players wanted to be able to shoot enemies hiding in tents, for instance, so in DF2 bullets will go through certain structures where it makes sense. A layer of waterproofed canvas will no longer provide cover against the M4 carbine, much less a hail of slugs from the SAW."