NMA has collected some comments from J.E. Sawyer answering questions about the F:NV Gun Runners Arsenal item pack DLC. You can read them on his Formspring account or at NMA. Here's the sort of thing you'll find:
I know your not sinking to EA'snickel and diming for clothing and weapon packs that cost a few bucks each but still not a road I want Obsidian to go down. One day just like Mass Efect 2 you'll charge $3 for a few diff clothing options.
I specifically asked to make GRA because I wanted to show players, publishers, and developers that you could make a reasonably-priced weapon pack that added more than two retextures.
Well, that and because I wanted to add some more weapons and ammo types.
In any case, I feel that players will get a very good value for GRA. There's a lot of cool stuff in it.