Yeah, that's going to require a new PCB design.
Digilent has routinely kept the configuration related portions of their schematics proprietary. At one time this information was proprietary to Xilinx IIRC. Since then, Xilinx has released the details of the protocol--so all is not lost. If you know where to look, the information you need can be found elsewhere. FTDI provides examples. Intel/Altera provide examples. Other Xilinx boards have examples--just not DIgilent. If you struggle to find what you need, I know Digilent has entertained the idea of people purchasing this information from them.
My personal challenge with the 3.3V boards is that 1) there are so many 3.3V peripherals/PMods out there, 2) I'm not sure I've seen the rest of the world agree on whether the next standard should be 1.8V, 1.5V, 1.35V, or 1.2V. Many projects I've been on require several voltage standards, depending upon which part is being accessed. 3) Worse, some parts like SD-Cards want you to start out at 3.3V and then switch to a lower voltage. So, while 3.3V may be an ancient standard, it's still more of a workable standard than many of the lower voltages have become.
Dan
