"Dire Straights and Dead Weight"
The episode title doesn't indicate a whole lot. The 'dire straights' likely refers to the dire conditions or possibly is even a challenge reference. The 'dead weight' part of the title is pretty obviously refering to Billy, who we know from the promo is very lazy. According to Cristina's confessional, Ozzy wants to throw the challenge. Cao Boi's racist jokes also made air in the promo. Keep in mind that these are likely misdirections, since it was shown pretty blatantly.

This week's challenge is quite a challenge in itself to figure out. We aren't sure from the vidcaps given to us whether they are one or two challenges, but at this point, it looks like we have been given footage of the immunity challenge only.

Raro and Hiki are competing side by side, linked together by a rope. Two Raro, Candice and Jessica can be seen participating.	The tribes must traverse through some obstacle course. Nathan catches a glimpse of the tribe ahead of him (Raro).	A shot of Puka going through the obstacle course. The belt on Becky can be seen worn later as they are traversing rope section.
		(far left): Cao Boi, Yul, Becky and Brad are participating in the challenge, Jenny is sitting out. (far right): It appears that Puka is ahead of the farthest tribe in the picture, Raro. Hiki, which is supposed to be sandwiched between the blue and green tribe, is nowhere to be seen. Aitu's rope is completely straight, so they finished or are behind. Puka should be safe, due to their relative position to the others.
		(far left): A happy Raro = wins something., but it probably is unrelated to the challenge shots given, possibly reward challenge winners? (far right): A sad Hiki = loses something or has someone sent to Exile, this is the same footage as the challenge caps

No clue, but if we had to pick from each tribe (based on logic that you take out the 'strongest'):

Aitu - JP | Hiki - Nathan | Puka - Yul | Raro - Adam

Adam and Candice have been the only ones that have been hinted at having a romance, making Raro a likely candidate for this episode's Tribal Council. Nathan is probably going to stay away from the women on his tribe. Aitu doesn't look like it has any romance in the air. And a far stretch would be Yul and Becky having a thing for each other, perhaps hinted at in the image to the right (but that goes against our challenge results). Keep in mind that Brad, Parvati and Nathan were shown in this particular promo. Message boards have speculated that Adam/Parvati and Brad/JP are some of the rumored romances among the 3 that Probst says there will be.