I now see (Intel NUC (Next Unit of Computing) DC3217BY SFF System Review | Breaking Inside the Unit) that the case comes with built-in antenna cables so my second question is no longer an issue. I'd still appreciate confirmation about the full-sized PCI-e port, though.
Mini-PCIe-based WIFI cards require only the PCIe lane in order to support WIFI communications. If Bluetooth communications is also required, the mini-PCIe connector must provide a USB 2.0 lane that can be used to expose this capability.
The mini-PCIe connector can support a number of capabilities. In addition to the PCIe lane itself, there could be a SATA lane and there could be a USB 2.0 lane. In the "half-length" connector on the NUCs, we provide the USB 2.0 lane but we do not provide the SATA lane, so MSATA cannot be supported. In the "full-length" connector, however, we provide both the SATA lane and the USB 2.0 lane, so just about everything can be supported via this connector.