Ring size for Froch vs Dirrell

Any one know what the size of the ring will be? Will a bigger ring hurt Dirrell since he will be moving more and not puching as much? Therefore Dirrell gets tired from running and doesn't hit Froch enough to slow him down. Will a smaller ring hurt Froch since Dirrell will be forced to fight more and come to find out Dirrell has enough power and accuracy to slow Froch down? Or will it be tradionally smaller ring benefits fighter and bigger ring benefits boxer?