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I don't think 8/28 is likely, they would've taken the online store down by now for orders. If nothing happens tomorrow, I don't think it'll come till sept.
 
Only MacPros have 64-bit EFI, right? I'm guessing that with SL's release- Apple will have a firmware upgrade for all 64-bit Intel Macs


Without a 64bit bootloader, how can you run a 64bit OS?
 
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