Actually those grills are not new. They are there since Magny-Cours, I think they added them when they made those aero changes during the silverstone test:
[IMG:739:513]
http://img454.imageshack.us/img454/8862 ... llsgk0.jpg[/img]
I dont think anybody mentioned it, but the size of the revised sidepod shields on the F2007 is now pretty huge, definitely bigger than before and the shape is a little different too, a bit BMW like:
[IMG:547:489]
http://img160.imageshack.us/img160/7741/image1yn0.jpg[/img]
Do you think they might have problems directing the air to the rear wing or maybe it's supposed to work better with this rear wing configuration? They were obviously having problems with the low downforce configuration in north america, maybe these upgrades are meant to deal with that...