Longitudinal fins on Ferrari rear wing
Ferrari's latest rear wing iteration again features a couple of interesting features which other teams have either not discovered or didn't find interesting enough. One of which are vertical fins as they are usual on front wings. These carbon fibre elements tend to help airflow to move straight along the wing and is particularly helpful under yaw. Previously, Honda made use of similar, larger items on top of their rear wing but had to call that off due to a request of the FIA.
Also marked is an interesting extension of the spacer that prevents the wing gap to close. At the wing's trailing edge, the 2 fins - only one of them is displayed in the image - extend above the wing. As the wing's maximum height is limited by the regulations, either Ferrari have lowered their wing or the FIA is silently allowing the upper extensions.
I thought every team had theirs extended higher??
I think the best example of another team using them as fences is Spyker last year, but you've already got a development blog on that one :p. Spykers were even more prominant I believe, something I thought the other teams would pick up on.