UFC 142: Aldo vs. Mendes is scheduled to take place on January 14th at the HSBC Arena in Rio de Janeiro, Brazil.
The current rumored/announced fight card appears as follows
Main card
Featherweight Championship bout: José Aldo (c) vs. Chad Mendes
Middleweight bout: Vitor Belfort vs. States Anthony Johnson
Welterweight bout: Erick Silva vs. Siyar Bahadurzada
Middleweight bout: Rousimar Palhares vs. Mike Massenzio
Preliminary card
Lightweight bout: Thiago Tavares vs. Sam Stout
Welterweight bout: Paulo Thiago vs. Mike Pyle
Light Heavyweight bout: Fabio Maldonado vs. Stanislav Nedkov
Heavyweight bout: Rob Broughton vs. Edinaldo Oliveira
Featherweight bout: Felipe Arantes vs. Antonio Carvalho
Lightweight bout: Edson Barboza vs. Terry Etim
Featherweight bout: Michihiro Omigawa vs. Yuri Alcantara
* card subject to change at anytime