Factory image and drivers of Nexus 5 are now available. To download the drivers, just visit the Google developers’ page here, and if you are interested in binaries, you can download those from here. Enthusiasts and developers, who want something to fiddle with can download the image and/or drivers from the aforementioned links.
It is interesting to see that Google is yet to make Android 4.4, a k a kitkat available for other members of the Nexus family. Is not that the chief reason why people buy Nexus devices?