The PicoEVB board has been modified to include the same I/O connector as NanoEVB. It is also wired to the FPGA in the exact same way.
Now the only difference between the two boards is that the larger board (NanoEVB, 2242 size) has a spare UART connection to the FPGA.
Here is the new block diagram which covers both boards:
Flexible, next-generation, open source software-defined radio
A palm-sized, reconfigurable Linux computer that connects to the real world: ARM + FPGA + Wi-Fi + Bluetooth + 180 I/O
A small, portable, USB-connected electronics lab-on-a-board that includes an oscilloscope, waveform generator, power supply, logic analyzer, and multimeter.