Price around $400, and shipping in November. According to Engadget, owners of the NEX-3, 5 and C3 will need a firmware upgrade for it to work, which raises the question whether it will work with the NEX-VG10 and FS100 without a similar update.
Engadget | Sony LA-EA2 lens adapter gets ready for its close-up in 'leaked' render
Engadget | Sony reveals three new NEX E-mount lenses, LA-EA2 A-mount adaptor with translucent mirror
PCMag | LA-EA2 Lens Adapter
PhotographyBlog: Sony LA-EA2
B & H : Sony Alpha LA-EA1 Camera Mount Adapter [Earlier model]
NEX-VG20 and LA-EA2