This was the original intent, since it was co-conceived by George Lucas, making it G-Level canon. However, with the purchase of the Star Wars property by Disney, this is no longer the case. Since then, the Star Wars canon has been reshuffled with the addition of
Star Wars: Rebels (2014) and
Star Wars: Episode VII - The Force Awakens (2015). Finally, the events of The Force Unleashed were directly retconned by the events of
Rogue One: A Star Wars Story (2016): in Force, senator Bail Organa knows of the existence of the Death Star because he was briefly imprisoned on it; this clearly has not happened in Rogue One, since he knows nothing of it. So Force Unleashed is now in the Star Wars Legends.