Agreeed with Rwaritsdario, you have to wait and see.
Chances are that if you dont OC or do mild OC, you wont need a RD600.
Rumors also say that only DFI wil release a mobo on the RD600, if that' the case, this motherboard wont be for anybody, you will probably have endless tweaking possibility and be ready to invest some time into tweaking.
But then again we have to wait. Im actually waiting for a round up of nVidia 680i SLi vs Rd600 vs Bad Axe 2, and then I buy a schweet system in december =)