From the IMDB's trivia page for The Hateful Eight:
According to Quentin Tarantino, this show is inspired by the Western television shows Bonanza (1959), The Virginian (1962) and The High Chaparral (1967): "Twice per season, those shows would have an episode where a bunch of outlaws would take the lead characters hostage. I love it in a Western, where you would pass halfway through the show to find out if they were good or bad guys, and they all had a past that was revealed. Just a bunch of nefarious guys in a room, all telling backstories that may or may not be true. Trap those guys together in a room with a blizzard outside, give them guns, and see what happens!"
I wasn't crazy about Django Unchained, but I'm pretty sold on this.
(Also, it's hard to believe this is only Tarantino's eighth film.)