Warframe PC passes 5.5 million users, update 12 patch notes & trailer released

Warframe developer Digital Extremes has confirmed that its MMO shooter has now passed the 5.5 million user mark, and has released its twelfth game update to celebrate. Get the patch notes and trailer here.

Here's the patch notes in full:

NEW WARFRAME: ZEPHYR - Specializing in air attacks and mobility, Zephyr dominates from above. Begin building her in the new Tenno Research Lab in your Dojo!
See Zephyr in action here:
SAVE DARVO - The Ties That Bind Alert Mission has players working to save the infamous Darvo once again. To participate, players can click on the in-game Alert and follow Darvo's guidance.
NEW GAME MODE - The new Interception game mode has players trying to intercept an interplanetary communication that is being beamed to four towers on the map. The more towers captured and held, the faster the message can be decoded. Players must also keep the enemy from decoding the message for themselves. Once the message is decoded by either side, the round is over.
NEW WEAPONS - A number of new weapons are now available including the Phage Shotgun, Jat Kittag Jet Powered Polearm, Dual Cestra Sidearms and the Akstiletto Dual UZI.
LEVEL EXPANSION - The Forest Tileset has been expanded to include all of Earth.
MOD STACKING - Mods will now be organized in stacks in the Arsenal to improve duplicate Mod management.
NEW TENNO LAB - The new Tenno Research Lab allows players to construct Warframes in a new way - in the Dojo!
NEW IN-GAME HUD - An updated Heads Up Display provides a refreshed and simplified playing experience.
ALTERNATE HELMET - A Paladin has never looked so good! Give Oberon a fresh look with a new Alternate Helmet - Oryx.
NEW WARFRAME SKINS - Customize your Warframe with four new Warframe Immortal Skins!