No further news relating to the cause, at least as far as I know. However, there are plenty of articles relating to the crash, including the following one which gives some pics of the helicopter before and after the ditching.
Shanghai heli ditching
And this one which has an artists impression of the route the heli took on departure from the vessel and into the sea...
Link
The helicopter has been recovered -
Link. Causes are likely to take a while as some say that the weather was good, another says that Fog is likely to be the culprit!
Gentlemen, start your engines........