This special collaboration was made alongside Capcom who directly oversaw the integration of these characters to the game. Their move sets, models, animations, combos, and abilities are based on their appearance in Street Fighter V: Arcade Edition. Capcom Executive Producer Yoshinori Ono comments about this collaboration, "The collaboration between Power Rangers and Street Fighter feels like a dream to me."
The first batch of playable Street Fighter characters are: Ryu, Chun-Li, Guile, and Akuma, which fans can unlock starting on May 16th via limited-time challenges, Morph Box unlocks, or by purchasing them for $4.99 per character. The next batch of characters are Cammy and M. Bison, which are both available on June 1st.
[Source: Power Rangers NOW, ComicBook.com, Neo-Saban Power Rangers]