As far as I know, all AM3+ mobos will only come with PCIe 2.0. As for BD supporting PCIe 3.0, not sure.
Ivy Bridge will support PCie 3.0, SATA 6.0 and USB 3.0.
Honestly though Light Peak will kill USB 3.0 (its speeds are up to 10Gb/s right now and plan to push to 100Gb/s in the future) and PCIe 3.0 will not be useful for a few more generations of GPUs.
SATA 6.0 is only useful if you plan on a SSD.