These are the changes of ARK: Survival Evolved’s Patch 201.2, grouped into categories for clarity. If not otherwise indicated, they’re quoted from the relevant Steam Thread.

Game Changes

• Cut taming time on Gigantopithecus by about 25% and he won’t stay aggro’d forever now either.
• IED’s don’t use demolition explosion type anymore, as they were not intended to. (effectively cuts their damage against structures by about 60%). They are anti-personnel/defensive.
• Scuba tank now slowly recovers your stamina if you are not moving in water.

Bugfixes

• Fixed issue with ‘Survival of the Fittest’ server player counts being incorrect after match reset.

(Original Announcement on Steam)

Here are the patchnotes of the previous patch (201.1)