First of all are some updates on the Sauber C29 - we've seen that they have recently upped their pace, and improved their reliability. First of all, the barge board now has a horizontal element connecting the leading edge to the chassis, and the turning vein has now gained an additional winglet where it curves inwards to meet the floor.
In addition, there is a small aero piece attached to the rear suspension, just below the rear brake cooling duct - seemingly, they have copied Mclaren's idea of the front brake cooling duct being turned into a flow conditioner, and have applied it to the rear.
There is also a nice detail on the front wing, where it appears there is a small channel on the inside edge of the endplate, presumably to direct air around the front wheel (judging by the shape of the channel).
Mercedes have been trying to refine their diffuser (sadly, pictures are not available of this yet), and appear to have modified the previous fluidic switch used to activate their F-duct so it has an additional benefit in yaw (i.e. when turning through a corner).
Onto Mclaren - with the problems caused by the heat of the exhaust during practise at Silverstone, it seems that Mclaren have increased the insulation, particularly around the lower suspension arms (note the metallic covering on the lower arm, which was absent at Silverstone). They have also introduced some shark gill vents in the rear bodywork - legal because there is a small slit running through the middle of each gill, which means that technically the gills are not connected, and therefore the gills are technically part of the same opening (both Ferrari and Mercedes have used this clause previously).
By way of comparison, here is the rear of the Red Bull car from a similar angle
Another picture, this time showing the rear of the Mclaren diffuser, and showing where additional thermal insulation has been added (the lighter areas on the diffuser)
