Seems they also reshaped all the elements in front of the wheel. Last year they had 7 elements there. They new reduced the 3 elements on the main plane to 2 and enlarged those, plus integrated last year's middle flap into the main plane. The elements also bent much more outwards. Last year they couldn't do that as much, since their endplate limited the space (the last element was also integrated into the endplate).
Here is my article on the F14T front wing, with drawings to make comparing easier:
http://www.f1technical.net/features/19217
The cascades are heavily influenced by Mercedes as you said. Even though the main cascade features winglets that aren't so much copied from Merc, notice how its support is bended. Does this ring a bell?
http://f1tcdn.net/images/features/2014/ ... rence2.jpg
The turning vane cascade obviously is also Merc's, but without the small cutout/detailing of the pylon.
I've noticed teams are converging onto 2 paths: one inspired by Mercedes, and one other by Red Bull, although most have a blend of the 2. Ferrari last year had their own typical style, with endplates and cascades of their own philosophy, which they seem to have dropped.