My biggest concern is hardware compatibility. Those PCIe ports are great but ultimately meaningless if you don't have drivers for more than a mere handful of obscure PCIe expansions.
Those should come once the hardware is out. There will be existing PCI hardware that has PCIe versions; since the registers are in the same place, the existing drivers will cope nicely. As for new hardware, well I've been
working on some drivers for a while now. Right now the cards I'm using have a PCI-to-PCIe bridge on them so that they plug into my A1, but I'm looking forward to being able to use PCIe directly. It's going to take a while before these graphics cards are fully used, but I'm
making progress.
Hans