someone pointed out elsewhere that this may be to combat red bull's large angle of rake as they use a high exhaust overrun flow to bridge the gap between the diffuser and the track, whilst i'm not a lover of how it's being done, if it means an end to the whole flexi wing / front wing clearnece debate than it's probably for the good.
also it's pretty stupid that cars are running at 100% throttle all the time and relying on ignition retard, apart from the "green" issue if it's not stamped on it'll have major implications when the turbo engines arrive as effectively the turbo's will be producing boost pretty well continually with no lag, something that david vizard used on his daughter's drag racing mini in the 80's to ensure she had full boost straight off the line.