User blog comment:Commdor/More ME3 Details from the BioWare Forums/@comment-2174252-20110421145516/@comment-737801-20110421155638

Or it may not be accurate. I doubt that BioWare would put in a completely new class this late in the series. I think it may be a misinterpertation of the GI article where it states that each class has a unique melee abiltiy, which could be "heavy melee". But I doubt that Heavy Melee is an actual class.