The news of developments seems very odd for this time before testing starts
Mclaren, Ferrari and Renault seem to be the ones going for it. I havent herd a thing about RedBulls development
Force India, Williams and BMW seem to just be producing something that will do the job so to speak, the only reports i've herd is that they are hoping to be ready for testing whereas Mclaren, Ferrari and Renault are really bosting them selfs up with talks of new specialist concept designs and other tweeks
looking forward to seeming what testing brings this weekend!