Sony panel do have native 200Hz refresh rate. Especially those on Andriod model. See for yourself.
Motionflow is not old new. Different maker just use different name but similar type of implementation.
http://www.sentinelit.com.au/gizknow/?p=92
This is no surprise to industry unless you are talking about those monitor class type of panel. Also take note, some low end panel in fact is only 50Hz but double up as 100Hz using similar kind of technology. This is for cost reason and improve in processor technology.
Whether you really has 50, 100 or 200Hz panel. The only way to tell is open up the TV and check. Sony or other brand is not going to tell you what type/brand of panel they used in that particular TV model. And it may be changed in different batch.
So never trust these sales man in telling you using Sony/Samsung or yyy panel. Worse if they tell you they are made in Japan!