According the Amazon.com product page for Bungie's Destiny, folks preordering the MMOFPS from Amazon, or other authorized retailers, will get automatic access to the beta when it kicks off early in 2014. Currently the placeholder "release date" is June 30, 2014.
Pre-order "Destiny" and receive access to the upcoming beta. Beta will be available in early 2014 on the following platforms: PS4 system, PS3 system, Xbox One, and Xbox 360. Limited time only. While beta codes last. Internet connection is required. Amazon will email you your beta access code within 1 business days of you placing your pre-order. Offer valid when shipped and sold by Amazon.com. This offer will be extended to all existing pre-orders. Limited to one per customer order. Amazon reserves the right to change or terminate this promotion at any time. Here's how (restrictions apply)
Find out more on the Destiny Amazon.com page.
The team also released a brand new trailer: