Regardless of your preferred name for the class, it uses a glaive (which is distinct from a spear) as its weapon and looks as if it’s going to be a very combo-heavy and “stylish” class to play. The story involves a fair dose of murdered families and sworn revenge, so take from that what you will. Check out the reveal trailer just below, and get ready to hear about when this is coming over to the localized version of the game.
Source: Translation; thanks to Porcula Salvania for the tip!