I managed to get a few more details regarding the mystery switch located next to the Crossfire connectors on the HD 6970 card.
According to what I know so far, the HD 6970 will have a dual BIOS and the switch is used exactly for that. The switch has two settings and according to AMD’s own slides, the setting 2 makes it “protected as factory default”, while the setting 1 is unprotected for user updates.
Either it means that AMD will release a BIOS that gives you more performance but also raises power consumption or something else, it is still not clear, but it sure does sounds pretty interesting.
Of course, I will know for sure on 15th of December