Good for Sony to bring a full frame camera to market for $2000. Why didn't Nikon or Canon do this?
Significantly fewer and generally lower quality lenses will remain a problem for Sony for a while, especially with trying to convince professionals and serious amateurs to switch away from Canon and Nikon.
Sony have quite a lot of Zeiss lenses made specially for the Sony fit.
(85mm f1.4 - damn I want that)