My thought is that there will be 2 ICs. One at the challenge site and the second at TC.
Much like last season...
As soon as Ralph departed Tribal Council (voted out 6-2), Jeff announced that the tribe could unwrap the mystery package (first received at the IC). The package contained a set of cards that announced that the tribe would immediately compete in an Immunity Challenge and then vote out a member of the tribe. Rob outlasted Ashley and Steve to win Individual Immunity. The castaways then went straight to the vote where they sent Steve to Redemption Island by a vote of 6–1.

While I can't point a finger at Whitney and say she is "highlighted" in the promos, specially any more than Jim or Ozzy, it is pretty much a forgone conclusion that the two boots should be some combination of Whitney, Jim and Ozzy.

For Upolu, Ozzy is at the top of the hit list with Jim in 2nd and Whitney in 3rd.
So dependent on Ozzy's immunity status goes the order of the boots.
If Ozzy is immune at the 1st TC then Jim will be voted out.
If Ozzy is immune at the 2nd TC, it's Whitney's turn to go.

If Ozzy is immune at the 1st TC (Jim is voted out) but is NOT immune at TC 2 then he's a goner.

For me, the only reason Whitney would be booted in ep 9 would be because Ozzy won both Immunity Challenges.
Not unbelievable but certainly more difficult.