Jeremy Renner will, of course, return as Clint Barton/Hawkeye, and Hailee Steinfeld will be playing Kate Bishop. The cast is also set to introduce Alaqua Cox as Maya Lopez, aka Echo, a deaf Native American superhero (and another Young Avenger!), who will be getting her own spinoff series soon.
Disney's official page for Hawkeye also lists Vera Farmiga, Fra Fee, Tony Dalton, Zahn McClarnon, and Brian d'Arcy James as part of the cast. According to Variety, Farmiga will be playing Kate's mother, Eleanor Bishop, while Fee's character, Kazi, is most likely a version of the comics villain known as Clown. Dalton is reportedly playing Jack Duquesne, aka Jaques Duquesne in the comic books, a version of Clint's morally-complicated mentor known as Swordsman in the comics.
Also of note: Florence Pugh is slated to appear in some capacity in the show, reprising her role as Yelena Belova, as first seen in Black Widow. More on that in a moment . . .