Already since the Chinese GP of last week, Mercedes are running a slightly different front wing which includes a tiny lip on top of the stacked element support.
Also marked in the image are some interesting details which show how much attention Mercedes have put into this new front wing after basically struggling with that part of the car for several years. The support for the stacked element for instance is not as simple at it may initially appear as it is clearly shaped differently long its height.
One other thing that is remarkable is the shape of the flap support, including the front wing adjuster. At most teams these are two separate element or a more solid item, but Mercedes have clearly put effort into making this item as small as possible to create the least possible effect on the airflow.