Anyone who played in the beta will get a special accessory for their multiplayer skin, the Hand of the Founder. To use the Hand on your skin, you find it under "Accessories", not "Arms"
Anyone who played Warhawk, and also played in the beta, will get special paint skins for their vehicles.
How To Get ThemEdit
Eu got them from the PSN Store (search for Starhawk). North America got them via PS3 XMB message.
If you didn't get them...fill out this form, you should get your code in a few days via email (P.S. They know what PSN IDs were in the beta, and what IDs played Warhawk):
If after a week you didn't get your code, if you live in North America, you call 800-345-SONY (7669). Tell the agent "Hello. I played Warhawk and in the Starhawk Beta but I haven't received my gift. Can you help me?" They will help you and are available Mon- Sat 6:00AM - 8:00PM Pacific / Sun 7:00AM - 6:30PM Pacific. They will check your account in the data base and give you a code if its legitimate.
Note: If you didn't get the PS3 XMB message, it may be because your privacy settings disallowed it. Your account must be enabled to receive Sony email. To enable that, go into your PS3 XMB, then into Account Management: Account Information: Notification Preferences. Make sure the top checkbox is checked.
What Are They?Edit
For more info on these bonuses, visit http://blog.us.playstation.com/2012/05/01/all-starhawk-beta-players-will-receive-free-gifts/
If you pre-ordered from GameStop, you were suppoed to get 1 free month of PlayStation Plus, as well as a coupon good for $10 off the Sony Bluetooth mic. These codes were supposed to print out on your receipt. If they didn't, call the GameStop you ordered from. If you ordered from the website, or the local GameStop won't help you, call the central GameStop number.