Battle rifle:
Seen in all trailers.
Assault rifle:
Confirmed in sparkast
Designated Marksman Rifle:
Confirmed in sparkast
Energy sword:
Confirmed here: http://www.gamedemption.com/wp-content/uploads/2012/04/halo_4_in_game_gameinformer_2.jpg and an elite is holding it.
Needle rifle/carbine:
Confirmed in the link above, also held by an elite.

Pretty difficult to read, maybe you should fix that.
You forgot the Magnum, Sniper Rifle, Shotgun, and Rockets.
You are seriously cracking me up today.
Grenade pistol, covenant carbine, Assault Carbine.
BR, DMR, AR, magnum, grenade launcher/pistol, energy sword, carbine, plasma pistol*, frag, plasma grenade, possible forerunner grenade.
*Jackals appear in screenshots (one can only assume that is their primary weapon)
What is this assualt carbine ppl are talking about? Is it the brute spiker?