Saw something on this on the web today.  The core of the gyp board has capsules of parrafin that melt at 73 to moderate the temp of the structure. Interesting concept as it seems like it could be much cheaper than other phase change solutions.  Although I guess it would only work in an A/C situation not heat.

I keep wondering how it installs and what happens over the years as holes are cut and it is patched.

Actually I think it would work better for heating. You warm the house during the day using active or passive solar. The parrafin melts storing energy. At night as the building cools the parrafin changes state back to a solid, releasing the heat it had stored during the day. It will be interesting to see what the cost will be compared to traditional drywall when they start commercial/residential sales.