Sony has released updated firmware for NEX E-mount cameras, FW v5.0 which updates the bodies to accept the new LA-EA2 Alpha Phase Detect AF lens adaptor. The update works for NEX-3, NEX-5, NEX-C3, NEX-VG10 and the professional video Sony NEX-FS100U.
Prior to this firmware update, the LA-EA2 only worked with the NEX-5N , NEX-7 and NEX-VG20. With the LA-EA2, a micromotor driven Phase Detect AF system is built-in, which allows the camera to focus with all A-mount AF lenses.
Key points of the new firmware update include Micro AF adjustment, when using this adaptor, for M-AF/SAL/SAM lenses, and the ability to assign AF points on the 15-point module, from the screen display.
For UK/Europe etc cameras (this site does not appear to have the VG-10 update and is slightly muddled):
NEX-5 (Windows) Firmware update , 15/12/2011
NEX-5 (Macintosh) Firmware update , 15/12/2011
NEX-3 (Windows) Firmware update , 15/12/2011
NEX-3 (Macintosh) Firmware update , 15/12/2011
NEX-C3 (Windows) Firmware update , 15/12/2011
NEX-C3 (Macintosh) Firmware update , 15/12/2011
For USA/Canada cameras: