It would be extremely short sited of them not to. After all they are aiming at the high end market, as I can only imagine the boards will be expensive when they come out. Anybody who buys them is going to be "in the know" and will want the option to upgrade there graphics card. The question is will they limit the use of only there card.
I.e. pairing an ATI card with the ATI chipset and the same with NVidia.
If you think about it it would be one way that both comanies could lessen the threat from the Kyro2.
ATI and NVidia primarily make Video cards so you would expect them to leave the option open for customers to add a card to their board producing yet more income.
<font color=blue>Elephants are the only animals that can't jump. Just as well!</font color=blue>