A blog called Greenlight has some interesting news:

The Japanese electronics giant has assembled a strategic plan to start making modular homes in about three to five years that will combine green construction along with sophisticated electronics to curb energy consumption.

While the energy savings ideas are new, Panasonic "already has a construction division that makes modular homes in Japan."

Though not likely to be coming to the US anytime soon:

the U.S. could be the last market it approaches...