I played around with my friends New s3 and was able to connect to my MacBook pro and transfer some of my songs from iTunes thru doubletwist today so I don't see why you should have any problems
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Sorry for the double post but I found an easy way to solve my problem. It seems that Kies Air client with Kies is the problem. If you just remove that component from your Kies program on your mac you should be able to sync just fine. The only problem is you won't be able to wifi sync anymore.
I have the same problem. The Android File Transfer app just does not recognize the SGS3. I also tried to connect on the Windows side of my Mac (Parallels) but no-go. I tried several of the "fixes" from online, but still not connected.