Halo Reach Weapon Attachments?

I watched a video for firefight, and some weapons looked different than in the multiplayer beta. Are there going to be attachments in reach? or are these other guns?

http://www.youtube.com/watch?v=wVTHwwCjKLk

check the dmr at start and pistol at the end

at the end its a mortar strike.

it just does not seem like something bungie would do...

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GENERATION 25: The first time you see this, copy it into your sig on any forum and add 1 to the generation. Social experiment.

it just does not seem like something bungie would do...

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GENERATION 25: The first time you see this, copy it into your sig on any forum and add 1 to the generation. Social experiment.

im not concerned with gun attachments or colors in Halo. I want them to keep the balance in the game like the rest pf the series