This is the very first short video showing the Nikon F to Sony E-mount electronic adapter at work. There is yet no info when the adapter will go for sale.
Current autofocus adapter available for other lens mounts:
Canon EF from Metabones (Click here) and [shoplink 37432 ebay]Kipon (Click here)[/shoplink].
Contax from [shoplink 37433 ebay]Techart (Click here)[/shoplink].