In the Community Update, you can see a teaser for the new firefight mode we are getting. The 2nd Spartan from the left (a blue and white protector?) has the AR out and a magnum on his hip. Those two are new skins and part of the same series of skins. The decimator Spartan looks like he might have the shark face AR that was teased on the March Update teaser (more like early April teaser lol).
What do you think of the new skins? Looks to me like some sort of yellowish orange with the UNSC emblem on the side.