Amazon is listing an April 8th, 2008 Blu-ray release for Mark Bussler's documentary about George Westinghouse, appropriately titled Westinghouse (http://www.amazon.com/exec/obidos/tg/detail/-/B000UO8EZE/).

Bussler makes it sound more tentative on his blog (http://markbusslerblog.blogspot.com/), but it does sound like there's a good chance of it coming, and it seems to be Blu-ray-exclusive.