Why would AMD send out cards to game devs that can't actually work? AMD had working samples for quite a while, it there are any cards at Computex or not can't be confirmed. Also, do you think that they are going to manage to actually change the cards settings just a few weeks before it's supposed to be in stores?
Very unlikely.
Maybe yes, maybe no. Explain why you think there is no BIOS on the cards. Im sure if before this was leaked if someone asked all the forum warriors here "How likely is it that AIBs dont have BIOSes for their cards?" everyone would say "No way."