As far as I know, all current prominent leaders in the Egyptian MB support nonviolence, which the group officially adopted in the 1970s--- that led to the more radical factions leaving to form groups like Egyptian Islamic Jihad and the Islamic Group.
There's a range of politics within that, though, from religious-conservative types who'd like a more traditionalist Islamic republic, to almost-secular moderates who focus on the movement's social institutions and see Islam's role as mainly spiritual/charitable. Since it's been operating semi-underground, I'm not sure anyone is 100% sure which leaders would end up dominating if it were to operate in the open and have some degree of power. The hope among western analysts is that its strength over the past ~20 years in universities and social services means that it's picked up enough educated moderates so that they would dominate a legalized version of the organization.