Won't happen for a longtime. I research this before and the best case is AFTER the AM3+/Zambezi. Yes, the current (new) AMD server CPU's support PCIe 3.0.
However, PCIe 3.0 for 'GPU' only lanes is laughable, the current GPU's (best of the best) barely can saturate the x8 PCIe 2.x -- so x16 PCIe 3.x is laughable -- MANY MANY YEARS away.
What needs improvement, which is in the works, SATA 6 Gbps. Also, a 'PCIe 3.0 Clean' MOBO: Chipset's, ALL pathways, ... last GPU will help alleviate 'bandwidth sharing bottlenecks.'
Bottom-Line, there's NOTHING to be Disappointed about for years! You're crying over Snake Oil!