The ASRock Z87 Extreme9/ac will provide two PCIe 3.0 X16 lanes, due to the add-on PLX chips. From the specs:
5 x PCI Express 3.0 x16 Slots (PCIE1/PCIE2/PCIE3/PCIE4/PCIE6:
single at x16 (PCIE2);
dual at x16 (PCIE1) / x16 (PCIE4);
triple at x8 (PCIE1) / x8 (PCIE3) / x16 (PCIE4);
quad at x8 (PCIE1) / x8 (PCIE3) / x8 (PCIE4) / x8 (PCIE6))
PLX PEX 8747 and PLX PEX 8608 embedded
When will it be sold in the US? Who knows, keep Googling for it.
A good heatsink? An extra good one, the best you can afford, Haswell runs warm.