Whole House Lithium-ion Battery

A new Lithium-Ion Battery to Power Up a House in 2011 for up to 1-week was announced by Panasonic. http://bit.ly/8GbLnl So why not sooner in 2011? It seems that all these new alternative energy announcements and products are always 2-years away. They appear to be a carrot on the stick. I recall that 2-years ago that in 2009 we would be able to purchase electric cars and plug-in hybrids. Now, this is still 2-years away. Huh?