Sony will soon release a firmware update for A900/A850 cameras,
A [Release w/oLens] item has been added: you can release the shutter even when no lens is mounted on the camera.
The range of the exposure compensation has been expanded: the range of the exposure compensation is expanded to ±5 EV (Before the update: ±3 EV).
An additional setting of the exposure step for the bracket shooting has been added:
the following setting has been added to the continuous bracket and single bracket shooting functions: The exposure has been shifted by 3.0 EV and the camera shoots three images (Before the update: Up to 2.0 EV). [3.0EV3] is indicated when this is selected.
The AF function has been improved
The speed and performance of autofocus have been improved. A noticeable result will be acquired when some telescope lenses are used. However, this depends on the lens mounted on the camera or the condition under which the subject shot.
src [PhotoRumors]
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