I noticed that the EVM has what appears to be a PLD. Is this code available? What tools (development and programming) are needed to emulate or duplicate?What is TI's recommendation if one wanted to goto a larger display (say a 5" color LCD)? What type of development in general would be necessary.
The PLD on our boards are used to control JTAG switching so that you can use the EK as a JTAG adapter to debug an external board via pass-through. We don't publish the code that goes into it but, generally speaking, it is unlikely that a product design would need this since JTAG pass-through is not something you would include in an end-user product.
Regarding screens, the sizes we have on our kits today top out at 3.5" since that seems to be the largest QVGA we've found that includes an integrated display controller and frame buffer memory. If you want to move to larger displays, you would have to use an external controller and frame buffer in addition to the display itself. How you connect these would depend upon the controller you chose - bit-banged GPIOs are a slower option that would work on some parts or Extended Peripheral Interface (if using a part that supports EPI) for wider buses.