Halo 5’s next update, Anvil’s Legacy, arrives September 8th adding Mercy Arena Map (Haven Remake), Temple Warzone Assault Map, new armor, weapon skins, and REQs like the Gunfighter Magnum, Hunter Fuel Rod Cannon, and possibly the Halo 3 ODST Pistol. Content Browser is also being added alongside the release of Forge for Windows 10.

Sound Dampener Loadout Weapon Attachments

Also spotted in the footage is a Neon weapon skin set, Emile’s flame armor variant, and a striped version of Jorge’s body armor.

Halo 5: Forge Comes to PC on September 8, Anvil’s Legacy Content Release Revealed
http://news.xbox.com/2016/08/24/halo-5-forge-comes-pc-september-8-anvils-legacy-content-release-revealed/

Halo Community Update – Announcing Anvil’s Legacy
https://www.halowaypoint.com/en-us/news/announcing-anvil-s-legacy