If you haven't already seen from some of the other websites in the LaunchPad community, TI is gearing up to release more MSP430 devices that are compatible with the LaunchPad. Some of these will be 20-pin chips, and will make use of the entire board. You can see details of the new devices on TI's website.
In regards to the new devices, some will include more of the MSP430 peripherals, most notably a hardware UART for serial communication. The UART uses the same two pins that TI chose to use on the LaunchPad for the timer-based UART used in the demo program that comes with the G2231 chip. Unfortunately, it swaps the transmit and receive functions on these pins. TI is working on potentially re-designing the LaunchPad, and has asked for the community's views on how to approach this issue. If you haven't already, go to the post on the E2E Community site, review the proposals they've given, and vote for the solution you think is best!