2009 regulations as they currently stand incorporate a number of elements to slow the cars down, most notably cutting the downforce levels significantly, explains Kobayashi. "Also, the banning of tyre blankets means that drivers will certainly have to be more circumspect as they leave the pits and this will be another area of tyre management where drivers will have to be vigilant.
The entire article from F1Technical can be found here.
I'm not sure if this has been covered, but it's interesting. This will indeed makes things a bit tricky.