Source: http://valltergaming.blogspot.cz/2013/06/premium-vehicles-changes-in-86-update.html?showComment=1370790912535#c2308734353144119631

Earlier today, developers hinted at the fact that in order to compensate the armor loss for Superpershing, it will also recieve a buff. Now, Vallter (one of the developers on his blog) unofficially confirmed that (possibly amongst other changes), Superpershing will recieve more penetration, around 200mm: