Halo 4 Specializations ~PunxsutawnyFil

It's Been Confirmed

343 had already announced that there would be Specializations in Halo and there were rumors going around about how certain armor gave you a certain specialization, however, this is not the case. 343 has confirmed that Specializations enlist you into certain rank paths and as you rank up in that rank path, you will unlock  armor sets, visor colors, emblems, armor mods, and weapon and armor skins. The armor sets do not affect your gameplay! The only thing that affects your gameplay is the armor mods, which you can use with any armor. The armor mods may seem similar to perks on COD at first, but they're actually more like classes on Battlefield. Armor mods allow you to customize your role in the game. 

Get all the details here: http://halo.xbox.com/blogs/Headlines/post/2012/08/15/The-Halo-Bulletin-81512.aspx