These are the changes of ARK: Survival Evolved’s Update 177.0, grouped into categories for clarity. If not otherwise indicated, they’re quoted from the relevant Steam Thread.

 Dino-Changes

• You can now make the T-Rex ROAR!!! with alt fire. The first of many 😉
• A new Dinosaur will be added???
• Custom Skinned Mammoth Saddle & Sabertooth Saddles
• Flyers do 60% less damage to structures
• Can now adjust a setting for whether you want your dino to auto-collect inventory from things it kills
• Guns/explosives are 20% more effective against dinos

New Structures

• Reinforced Steel Vault, for when you gotta store a crapton of items with maximum security [Our Item Spotlight is here, -Ed]
• Wood Spike Barricade, for when you just gotta build a quick defense on the cheap.
• “Bookshelf” to store mass quantities of blueprints and notes and implants

Server

• Linux Dedicated Server

Performance

• Major improvement to asynchronous background streaming, resulting in smoother overall performance when moving through the environment

Bugfixes

• fixed water jar blueprint
• fixed fall damage to never get a super high instantaneous velocity, is now time-based.

Tribe

• Tribe governance can now be reset
• Locked Doors now always accessible by Tribemates (PIN-coded doors follow the governance setting)

Storage

• Storage Boxes now only use slots, not weight
• Doubled number of item slots on “Smity”, “Fabricator”, etc

Supply

• Supply Drops now give crafted items again, albeit at adjusted rates

 

(Original Announcement on Steam)

Here are the patchnotes of the previous patch (176.0).