Here's a list of content that may be coming out for halo 5 in future updates
Possible content:
weapons:
Brute sniper
Spiker
Brute mortar (HMG)
Brute magnetic missile launcher
Brute scope for loadout weapons
Orange grenade launcher variant (has cluster bombs)
Weapon skins:
Blue, cyan, yellow and purple skins (there may be more colours)
America magnum skin (possibly other countries as well)
Unicorn fist 343 skins (legendary)
Vehicles:
Blue normal AA wraith
Temple AA wraith
Game modes:
Arsenal (gun game)
Warena (Arena mode with reqs and energy)
Warzone bomb Assault
Warzone CTF
Armour:
Whale helmet (legendary)
Piggy helmet (ultra rare)
Classic helmets (confirmed):
Mark V Delta (legendary)
Military Police (ultra rare)
Recon Gen1 (ultra rare)
EVA Gen1 (ultra rare)
Security Gen1 (rare)
Operator Gen1 (rare)
EOD (rare)
CQB (rare)
Pilot (rare)
Pics:
[url=http://i.imgur.com/VPnJiUy.jpg]pig and whale helmet[/url]
[url=https://i.imgur.com/PqRk2s6.png]Unicorn fist[/url]
[url=https://imgur.com/a/KCoLA]classic helmets[/url]
[url=https://screenshotscontent-t5002.xboxlive.com/0009000006485cfd-cf21d717-992f-44e4-beac-c1c053c36c31/Screenshot-Original.png?sv=2015-12-11&sr=b&si=DefaultAccess&sig=5pQTE4l3u6PNhz2CJZzHKTqdfXGmBYUCf7PpQcZvWbQ%3D]ingame skin[/url](was able to get this pic when playing with someone from 343)
Sources:
Gamecheat13
Halo waypoint
Halo Reddit
In-game
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Is..... Is that a cat?