http://mmajunkie.com/2015/02/tuf-21-features-att-vs-blackzilians-500k-grand-prize-16-welterweight-cast-members?utm_source=fb-TUF21DETAILS&utm_medium=social&utm_campaign=facebook
Sorry if someone already posted, but this could be cool. Gives some new life to the show.
"According to today’s announcement, though the fighters will live together, they’ll continue to train separately at their home gyms. However, the fights won’t take place at a neutral site, and instead, bouts will take place at one of the two gyms. Additionally, matchups won’t be revealed until weigh-ins, when each fighter will learn who his opponent is."
interesting...
My money is on Steve Carl 
Could you imagine finding out at the weigh-ins that you've paired up against some destroyer like Nate Diaz, Forrest Griffin, Bader or Rashad?
I was skeptic about this at first, but finding out the details makes this more interesting.
Some decent fighters like Buscapé and Carl will be in this.