Two new OWL drop-in 52mm filter adapters for Sony E-mount cameras were announced in Japan: one for Canon and one for Nikon lenses. These new adapters will let you insert a 52mm filter between the lens and the camera (via DCWatch).
Kipon announced a new auto-focus adapter with interchangeable graduated ND filters (four steps). Shipping will start before March 15th. The price is $428. Additional information: