It's been fixed - just make sure that you get one with a different serial number series!
Hard to check if buying online, but given that the issue is now 2 months old, I'd imagine that if you stick with reputable dealers like B&H, you'll find that all their stock has been fixed or replaced.
BTW - I have an A640 and love it. Took it to Europe as my principal camera this summer since I didn't feel like lugging all my DSLR equipment and it performed very well.