Some new clues..
From transcript of new online preview:
VO: Only 4 Survivor episodes left. CBS Thursday.
TEXT: 4 SURVIVOR EPISODES LEFT
Jeff: We're gonna get catty.
VO: In a new game of truth...
Shii: Stupid players.
VO: Someone could get crushed.
Alicia: I don't like these people anymore.
VO: And, an endurance test for immunity...
Jeff: How much more you left in you Rupert?
VO: Move a muscle, get washed out!
VO: Plus, will Survivor sweethearts Rob and Amber turn on each other?
Amber: Even if I'm lying to him, he's gonna trust me.
VO: There is a million reasons why.
TEXT: A MI$$ION REASONS
Rob: She may be playing me, and if so... hey, she had me fooled.
Also, the RC looks like a trivia game - every answer right, cut someone's rope to break their mask (just like S6). Winner gets to choose what everyone else eats.
IC is an arm in the air endurance challenge like S3... it shows either Amber or Alicia getting the water on them - but I think it's just an image that they use when describing the challenge.
Survivor Amazon -- Episode 8 -- IC
After receiving masks to decorate for the upcoming Immunity Challenge, the tribe met Jeff Probst and listened as he explained the rules. The Survivors would be asked a series of questions based on Brazilian and Amazonian culture and basic survival skills. The decorated masks were hanging in front of a suspended log. Each time a question was answered correctly, the Survivors would use a machete to cut through three different ropes that would eventually release one of the suspended logs, propelling it through the air to smash one of the masks. Once a Survivor's mask was destroyed, they would be out of the game. The person whose mask was left intact would win.
IC~Water Bucket Tip
Wooden towers support large water buckets triggered to tip and discharge their contents of water at the slightest pull. The trigger mechanism is attached to a chain and shackle, which in turn are attached to each Survivor's wrist. The chain leash is short enough to force the Survivors to have their arm fully extended upwards. Fatigue is the determining factor in this endurance challenge. The last person standing w/an untipped bucket gets Immunity.
Redux of Survivor: Africa Episode 7 Immunity Challenge "When It Rains It Really Pours"
The Survivors are each placed directly underneath a bucket filled with water. The bucket is connected to the Survivor's wrists by a rope just above their head. If a Survivor moves his or her hand, the bucket will tip over and shower the person with water. The last Survivor to remain dry with their hand held above their head wins