Short answers, pulled from the story.
Capcom developed the game with Ryota Niitsuma serving as producer after reacquiring the license in 2008. Development officially began in 2008 following nearly a decade of hiatus caused by legal issues.
Ryota Niitsuma replaced the complex four-button system with three undefined buttons for punches and kicks. This new scheme allows players to string together attacks using just three buttons while performing special moves through specific joystick movements.
Capcom released the game on the 15th of February 2011, in North America followed by Japan and Europe days later. Downloadable content featuring Jill Valentine and Shuma-Gorath became available starting the 1st of March 2011.
Capcom announced on the 30th of March 2011 that it had shipped more than 2 million copies within a month and a half of its debut. The title reached number 2 in the United Kingdom PlayStation 3 sales chart behind Call of Duty: Black Ops.
Niitsuma decided against using Japanese voice actors because he stated that having the Marvel roster speaking Japanese did not mesh well with their established image. This decision ensured each character felt true to their source material while functioning within the game mechanics.