Better onboard graphics, hex core CPU support, USB 3, SATA 3. And right now AMD is asking manufacturers to not allow core unlocking abilities. That may change though.
If you're getting a new board anyway there's no reason not to get one. 890gx will be released tomorrow anyway so it's not a terribly long wait
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It will be a test board hooked up in this
http://www.techreaction.net/forums/showthread.php?t=1663 for AM3 testing. I hate to link to another forum but that is where I do most of my stuff. When finished I will post some info here as well though. What I need is a board that wont go pop so I was thinking of holding out for an FX as they usually allow better power management. Not that the G GX or X wont do it but the manufacturers dont seem to put the extra umph into it.