In honor of the Call of Duty Championship this year, Activision and Xbox are hosting a promotion that allows stream watchers and gamers alike a chance to earn a free Nanotech Personalization Pack Code in addition to watching COD Champs using the event player app, or by watching it on the On Demand VOD by April 5th. Codes are rumored to be emailed within 8 weeks of watching the Champs, a better answer will come later.
"Everyone who watches the finals on their Xbox One or Xbox 360 console live on March 29 or on demand through April 5 will automatically receive a free Call of Duty: Advanced Warfare Nanotech Personalization Pack download code. Plus you’ll also be entered to win great prizes like an Xbox One Limited Edition Call of Duty: Advanced Warfare Bundle, Xbox Live Gold Memberships, and Xbox Gift Cards!"
Source: Charlie Intel