The Kansas City Chiefs will indeed host the Pittsburgh Steelers on Sunday Night Football in just less than two weeks. NFL PR man Brian McCarthy tweets that the NFL did not make any changes to the flex scheduling for Week 12 which means KC will stay on Sunday night.
The league's flex scheduling allows a game on Sunday night to be flexed out to the afternoon and replaced by a different game. That won't be the case in Week 12.
There had been some speculation (by fans, at least) as to whether the league would move a more attractive game into that slot but this really shouldn't have come as a surprise to anyone. The Chiefs aren't Indianapolis-Colts-bad -- Colts vs. Patriots later this year was already flexed out of Sunday night -- and there aren't any overly-attractive games to put in its place.
That, plus the Steelers are a huge draw for the national crowd.
So, for better or worse, the Chiefs will be in primetime two weeks in a row.