Short answers, pulled from the story.
Capcom released Street Fighter II Turbo: Hyper Fighting in 1992 as an enhancement kit for existing arcade cabinets. The game marked the final arcade release using the original CP System hardware before the industry shifted to the newer CP System II platform.
All fighters except Guile and the four Grand Masters received at least one new special move. Ryu and Ken gained the ability to perform a Hurricane Kick while airborne, E. Honda added a Super Body Slam attack, Blanka acquired a vertical rolling attack, Chun-Li learned Kikoken, Zangief utilized a Turbo Clothesline, and Dhalsim gained Yoga Teleportation.
Game Machine listed Street Fighter II Dash Turbo as the second most successful table arcade cabinet of January 1993 in Japan. It went on to become the highest-grossing arcade game of 1993 across Japanese markets and held the top position for software conversion kits in March, April, and June of that year.
The February 1994 issue of Gamest nominated Street Fighter II Turbo alongside Super Street Fighter II for Best Game of 1993, though it finished sixth overall. Electronic Gaming Monthly named Street Fighter II Turbo the best arcade game of all time in 1997, and Complex ranked the SNES version sixth on their list of The Best Super Nintendo Games of All Time in 2018.
Electronic Gaming Monthly described the game as the last and best refinement of the original Street Fighter II formula before major changes arrived. Modern critics view the title as the final evolution of the classic CP System hardware era because it preserved the feel of earlier entries while adding necessary complexity for competitive play.