"Check your PMs" - meaning, check your private messages in the forum. In that instance, it was directed to dejsav.
Unfortunately, I can't provide any information ahead of any public announcements from AMD. I also am not aware of all the specifics and business mechanics of how the promotion works between game publishers and AMD. My thoughts are that the game titles offered only change when there are no more game-keys available for a particular title, and the game's publisher does not want to provide more. OR, new games are added. OR, a game's publisher wants to remove their title.
AMD Customer Care
The information presented in this document is for informational purposes only and may contain technical inaccuracies, omissions and typographical errors. Links to third party sites are for convenience only, and no endorsement is implied.