Short answers, pulled from the story.
Ultra Street Fighter II was released on the 26th of May 2017. The game was announced for the Nintendo Switch in January 2017 and became a pivotal moment for Capcom's strategy on the platform.
Series producer Yoshinori Ono drove the decision to revisit Street Fighter II. He wanted to return to the franchise's roots while simultaneously appealing to a younger generation.
Ultra Street Fighter II offers Classic mode with original pixel art graphics and New Generation mode with updated high-definition graphics. New Generation mode features artwork produced by Udon Entertainment and utilizes newly remixed music alongside Japanese voices from the Street Fighter IV series.
Ultra Street Fighter II expanded the roster to include Evil Ryu and Violent Ken. Evil Ryu first appeared in 1996's Street Fighter Alpha 2 and Violent Ken made his official debut in a Street Fighter game after previously appearing in SNK vs. Capcom: SVC Chaos.
Ultra Street Fighter II carried a retail price of US$40 when it was released on the 26th of May 2017. This price point drew significant criticism from reviewers and players who felt it was too high for an updated port.
Critics pointed out issues with the D-Pad and analog stick controls on the Joy-Con controllers that hindered the gameplay experience. The Way of the Hado mode required holding the Joy-Con in both hands to perform attacks which was particularly prone to confusing attack inputs.