Not a massive amount tbh. You already have USB3 and SATA 6gbps, though we'll have to wait until tomorrow to see if the new boards clocking ability differs a lot to the older models when using the X6.
If you do get the X6, make sure you've got your BIOS up to date and ready before putting it in.
If you do get the X6, make sure you've got your BIOS up to date and ready before putting it in.