I don't pretend to be the biggest Halo fan in the world, but I've played the games plenty, so I think that leaves a little room for interest. Besides, Halo is huge. It's huge everywhere, in dorms, high school students, douche bags... A LOT of people play Halo.
That being said, I think Halo 3: ODST went out the door to much fanfare that has quickly died down into a hushed environment of waiting for Modern Warfare 2. Luckily enough, Halo: Reach gets brought back to the average gamers attention with these leaked screenshots.
What can you really tell from them? There'll be new weapons, new campaign, new enemies. I'm sure we could have guessed these things. I want something that tells me how Reach will be different from every other Halo game I've played.