Note the yellow buff around Malcolm's neck...

Only 6 Tandang shown...they're getting to sit a female. So this would suggest that the medivac takes place before the challenge. Otherwise, the teams would be even at 7, and everyone could compete.

As I see it there are several possible scenario's...

We have seen them all show up at supposedly a challenge area, where:
1. Dana is still there, no medivac yet
2. there is a reward challenge
3. no challenge run, and Matsing is divided. Malcolm to Tandang, Denise to Kalabaw
*I like dabo's original spec about winner gets first choice of who to pick....just saying!

We have an IC where it appears 6 are on each side competing:
1. This is a different challenge than the first one they did
2. That makes this an IC
3. 6 compete from each tribe
4. Implies that medivac has already occured, Dana gone

Has there ever been an IC run AFTER someone has been removed from the game?

One other thing I would like to comment on is the misdirection clue regarding Jeff, because, with Malcolm on the Tandang tribe, I think it gives them a leg up. So, I would favor Tandang to win the challenge now. Denise is good, but is she that good?

So, if Tandang is favored to win, and there is going to be a boot from Kalabaw, then that clue from the last promo becomes important to me... can the former baseball star keep his identity a secret?

If Dawson spills to Jeff that she knows who he is, and wants to use this to her advantage, then she could become the new target. Or, the plan will work and Jeff Kent will be the new target.

I think that this will be our boot story if there is indeed a boot after the medivac.