OnePlus states the Oxygen OS is light in nature and wont be system heavy.

The OS also features several essential features, screen gestures, quick configs and an improved file manager.

Oxygen OS carries over gesture support, first available on Oppos Color OS and adopted on Cyanogen OS 11s.

OnePlus Oxygen OS is now available for download : how to install

The following instructions assume you haveFastboot and ADBinstalled.

Step 1

You should now have the recovery installed.

Step 2

Unzip oxygenos_1.0.0.zip file youve just downloaded.

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In the uncompressed file you will see a oxygenos_1.0.0.flashable.zip file.Copy oxygenos_1.0.0.flashable.zip to your phone.

Step 3

Boot into recovery mode again.

Step 5

After the wipe, locate the oxygenos_1.0.0.flashable.zip and install.

This command will successfully flash OxygenOS onto your unit.

Flashing OnePlus One does not void your warranty.

source: www.techworm.net