Hello kd3bj2, I'm sorry my first reply didn't answer all of your questions. Fortunately, we check these discussion forums at NI regularly to make sure all customer questions get answered even when the first response may not be what you were looking for. I'm sure we can work together to get you the information you need.
The PXI-565x devices contain a normal cPCI J1 connector. There is also a 48 pin J2 connector that is smaller than normal cPCI J2 connectors. This is to allow the PXI-565x devices to plug into older PXI chassis as well as newer PXI-PXIe hybrid chassis (in PXI or hybrid slots). The PXI-565x is still a PCI based device and uses J2 only for timing and triggering lines. There are no power rails connected to J2 as per the cPCI specification.
The PXI-565x requires 5V keyed VIO backplane slots. You can tell this from the color of the key used in rows 12-14 of the J1 connector. The PXI-565x uses a blue key, which in the cPCI specification dictates a need for a 5V VIO slot.