UPDATE: Activision Support and Treyarch have now removed the estimate time and indicated codes will be sent “later today”…
Original story: Activision Support has updated their FAQ for the Black Ops 3 beta that begins soon for Xbox One & PC. We now have confirmation of when codes will be emailed out, and similar to the beta launch on Playstation 4, Xbox One & PC users should be expecting their download codes via email about 8 hours early or 4pm PT today to be exact. Check out the rest of the FAQ for more details..
How big is the Beta file?
To make the Beta a fun and valuable experience, we’ve packed it with a lot of content. Therefore, the file is approximately 15 GB and download times will vary based on location, server traffic, and connection speed.
What’s the difference between my Beta code that I received and my Beta token?
Beta Access codes are provided on pre-order receipts by retailers, and reserve your spot for the Call of Duty: Black Ops III Beta. Beta Access codes can be redeemed at callofduty.com/blackops3beta.
Beta Tokens will then be emailed to you from Activision on a rolling basis beginning at approximately 4:00 PM PST on August 25th for Xbox One and PC users. Beta Tokens need to be entered into the code redemption tool on the platform you have designated in the registration process, and will allow you to download the Call of Duty: Black Ops III Beta. Find out how to redeem a Beta Token.
SOURCE: Activision Blog