I do not have exact info on future products at this time. What I can say is that every Intel X79 Express board I have seen supports PCIe 3.0, which should be the only requirement currently for Ivy-bridge support.
As mentioned, I am also using this board for memory reviews right now, so I'll be sure to be staying on top of any updates that may affect functionality, including looking at PCIe 3.0 devices when they become available.
If you are not overclocking, a standard case install should provide more than adequate cooling. The issues with cooling stem from overclocking, and the fact these CPUs can consume an easy 250 W, even @ just 4.4 GHz. I would really suggest to those looking for long term overclocks over 4.0 GHz, that they use watercooling with a block on the board's VRMs as well. But at stock, the 130 W consumed doesn't have that large of an impact.
And that applies to any board, not just the ASUS P9X79 Deluxe. If anything, the large coolers used on the ASUS P9X79 Deluxe make cooling less of an issue than with some other products.