According to the latest issue of Famitsu, Tron Bonne and a Servbot will join the roster for Project X Zone. Alongside Mega Man X and Zero, that brings the total Mega Man characters up to four! The characters will be voiced by their veteran actresses, Mayumi Izuka and Chisa Yokoyama, respectively.
Source: Andriasang (thanks for the tip, Rock Volnutt!), Image: The Mega Man Network