Well, seriously, most of it is already out there. 2x PCIe 16x (16 lanes connected, they'll scale down to 2x 8x if both are populated) 3x PCIe 1x (Xorro slot in line) 2x PCI legacy slots 4x SATA 8x USB Onboard Audio 4x RAM socket
It can run 8 programs at 25% each, so that makes it how many cores?
As far as I can see, the only unknown factors not yet guessed are the CPU itself, Xena and Xorro...