Short answers, pulled from the story.
Star Wars: The Force Unleashed II was released in the United States on the 26th of October 2010, in Australia on the 27th of October 2010, and throughout Europe on the 29th of October 2010. It launched on PlayStation 3, Xbox 360, Wii, Windows, Nintendo DS, and iOS.
Haden Blackman wrote the script for The Force Unleashed II. LucasArts gave him only three weeks to complete it. Blackman drew influence from Darksiders, Uncharted 2: Among Thieves, and Heavy Rain.
Sam Witwer provides both the voice and physical likeness of Starkiller in The Force Unleashed II. Witwer also voiced Emperor Palpatine in the game after lobbying for the role during a script read-through.
The Force Unleashed II sold 500,000 copies in the United States within its first two weeks, making it the fifth best-selling game of October 2010. In the United Kingdom it sold 56,064 copies in its first week. Sales fell below LucasArts' expectations.
The Force Unleashed III was cancelled after Disney acquired Lucasfilm in 2012 and subsequently closed LucasArts in 2013. In February 2013, Sam Witwer and Haden Blackman had confirmed the game was being considered for PlayStation 4, Xbox One, and Wii U before the closure ended its development.
No. In 2014, the entire Force Unleashed multimedia project, including The Force Unleashed II, was moved into the Star Wars Legends continuity, which covers stories no longer considered official Star Wars canon. The series never received a canonical conclusion.