The FMC adapter item on the specs is an standardised interface adapter. Looking at the instructions for some of the previous dev kits points to an FMC PCIe module that seems like the right kind of thing:

http://www.hitechglobal.com/FMCModules/FMC_PCIExpress.htm

Obviously you'd want to check a bit more carefully. I'mjust pointing out that PCIe seems like it's a go-er with the hardware right now even. :)