Ghost Recon: Future Soldier's multiplayer beta will begin this summer exclusively on the Xbox 360. Today Ubisoft explained how exactly you'll access it.

They reiterated in an online FAQ that you have to buy Splinter Cell: Conviction on the Xbox 360 for access. However, you won't get a voucher code with your copy. The Conviction disc itself is your key to the beta.

"Once we open the beta, a new menu line will be activated in the Tom Clancy’s Splinter Cell Conviction main menu. When you insert this disk, you can register for the beta through that menu line."

In other words, you won't be able to trade in your copy of Conviction - not until you register for the beta, anyway.