Samsung has stated that Android is their focus point in the near future. Bada is their own platform and it would also remain with same priority for Samsung who is the South Korean tech giant.
There is good demand for Android in the market with it being the second most popular mobile platform in the US market right now. This might have made the company think to shift their attention to Android.
Windows Phone 7 is set to arrive. Samsung said that there is some professional demand for this new platform though things can change in the coming months.
Symbian is not on the horizon for the company for now. It remains to be seen if the situation would change next year when Symbian3 and Windows Phone 7 would be widely available for deployment.