Ferrari:
Pre-Bahrain:
Imola 06:
Looks like they added some vertical stabilizers on each side of the top of the transmission area. And some gills on either side of the endplates. Also, it looks as if the shape of the diffuser area under the brake light has been lifted up which should improve the downforce generated by the diffuser.
Looks like the front-wing endplates have more of a wiggle to them, and some sort of 'spill-guard' on the top of the rear of them.
Edit: Ferrari 248 F1 - revised front wing
Part of extensive changes to the Ferrari at Imola, designed to improve performance and overall balance. New endplates sport a flat upper profile instead of the previous sculpted one, with a horizontal triangular fin at the rear (1). This improves airflow management close to the wheels. The additional fins on either side of the nosecone (2) now have a wing-shaped profile, which improves airflow efficiency between the chassis and the tyres. All these changes improve the quality of the airflow passing underneath the car, which is then extracted by the rear diffuser.
Also, thought this was a great shot of the mirrors. Very obvious flow conditioners when you see it up this close:
Honda
Added 'ears' in front of both sidepods. Strange curvature to the leading edge of the winglet on the airbox. Is it just me or does the intake for the airbox look smaller?
BMW
This car just keeps getting uglier. The upper front wishbones have some kind of bulbous growth.
Does anybody know why the lollipop has such a weird shape?
Edit:
BMW Sauber F1 06 - revised front wing
A slightly different configuration for Imola. The double-decker concept has been revised, with the additional upper profiles shortened by around 5 cm, to reduce drag and improve top speed on this fast circuit. The key factor is the reduced surface area exposed to the airflow. The angle of the wing flap remains unchanged.